Common Network Ports Reference

Find common TCP and UDP port numbers and associated service names for firewall, server, security, and network troubleshooting.

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Reference for common TCP and UDP service names. A registered port does not prove which application produced the traffic; verify the current IANA entry and inspect the service before changing firewall rules.

1. Frequently used system ports

Port / transport	Service name	Current guidance
1	tcpmux	The service name “tcpmux” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5	rje	The service name “rje” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7	echo	The service name “echo” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
9	discard	The service name “discard” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
11	systat	The service name “systat” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13	daytime	The service name “daytime” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
17	qotd	The service name “qotd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
18	msp	The service name “msp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
19	chargen	The service name “chargen” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
20	ftp-data	FTP data channel.
21	ftp	FTP control channel.
22	ssh	SSH remote shell, tunneling, and file transfer.
23	telnet	Telnet remote terminal; unencrypted and unsuitable for untrusted networks.
25	smtp	SMTP server-to-server mail transfer.
37	time	The service name “time” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
39	rlp	The service name “rlp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
42	nameserver	The service name “nameserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
43	nicname	The service name “nicname” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
49	tacacs	The service name “tacacs” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
50	re-mail-ck	The service name “re-mail-ck” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
53	domain	DNS queries and zone-transfer traffic, depending on transport.
63	whois++	The service name “whois++” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
67	bootps	DHCP/BOOTP server traffic.
68	bootpc	DHCP/BOOTP client traffic.
69	tftp	TFTP file transfer over UDP; no built-in authentication.
70	gopher	The service name “gopher” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
71	netrjs-1	The service name “netrjs-1” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
72	netrjs-2	The service name “netrjs-2” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
73	netrjs-3	The service name “netrjs-3” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
73	netrjs-4	The service name “netrjs-4” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
79	finger	The service name “finger” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
80	http	HTTP web traffic without transport encryption.
88	kerberos	Kerberos authentication service.
95	supdup	The service name “supdup” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
101	hostname	The service name “hostname” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
102	iso-tsap	The service name “iso-tsap” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
105	csnet-ns	The service name “csnet-ns” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
107	rtelnet	The service name “rtelnet” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
109	pop2	The service name “pop2” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
110	pop3	POP3 mailbox retrieval without implicit TLS.
111	sunrpc	ONC RPC port mapper / rpcbind.
113	auth	The service name “auth” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
115	sftp	The service name “sftp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
117	uucp-path	The service name “uucp-path” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
119	nntp	NNTP network-news service.
123	ntp	NTP network time synchronization.
137	netbios-ns	NetBIOS name service.
138	netbios-dgm	NetBIOS datagram service.
139	netbios-ssn	NetBIOS session service, historically used for SMB.
143	imap	IMAP mailbox access without implicit TLS.
161	snmp	SNMP management queries.
162	snmptrap	SNMP trap and notification delivery.
163	cmip-man	The service name “cmip-man” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
164	cmip-agent	The service name “cmip-agent” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
174	mailq	The service name “mailq” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
177	xdmcp	The service name “xdmcp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
178	nextstep	The service name “nextstep” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
179	bgp	BGP routing protocol sessions.
191	prospero	The service name “prospero” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
194	irc	IRC chat service.
199	smux	The service name “smux” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
201	at-rtmp	The service name “at-rtmp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
202	at-nbp	The service name “at-nbp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
204	at-echo	The service name “at-echo” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
206	at-zis	The service name “at-zis” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
209	qmtp	The service name “qmtp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
210	z39.50	The service name “z39.50” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
213	ipx	The service name “ipx” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
220	imap3	The service name “imap3” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
245	link	The service name “link” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
347	fatserv	The service name “fatserv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
363	rsvp_tunnel	The service name “rsvp_tunnel” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
369	rpc2portmap	The service name “rpc2portmap” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
370	codaauth2	The service name “codaauth2” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
372	ulistproc	The service name “ulistproc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
389	ldap	LDAP directory access without implicit TLS.
427	svrloc	The service name “svrloc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
434	mobileip-agent	The service name “mobileip-agent” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
435	mobilip-mn	The service name “mobilip-mn” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
443	https	HTTPS web traffic protected by TLS.
444	snpp	The service name “snpp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
445	microsoft-ds	SMB file and printer sharing directly over TCP.
464	kpasswd	The service name “kpasswd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
468	photuris	The service name “photuris” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
487	saft	The service name “saft” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
488	gss-http	The service name “gss-http” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
496	pim-rp-disc	The service name “pim-rp-disc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
500	isakmp	IKE / ISAKMP key exchange, commonly used by IPsec.
535	iiop	The service name “iiop” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
538	gdomap	The service name “gdomap” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
546	dhcpv6-client	The service name “dhcpv6-client” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
547	dhcpv6-server	The service name “dhcpv6-server” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
554	rtsp	The service name “rtsp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
563	nntps	The service name “nntps” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
565	whoami	The service name “whoami” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
587	submission	Authenticated email submission from clients to a mail server.
610	npmp-local	The service name “npmp-local” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
611	npmp-gui	The service name “npmp-gui” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
612	hmmp-ind	The service name “hmmp-ind” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
631	ipp	Internet Printing Protocol (IPP).
636	ldaps	LDAP directory access with implicit TLS (LDAPS).
674	acap	The service name “acap” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
694	ha-cluster	The service name “ha-cluster” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
749	kerberos-adm	The service name “kerberos-adm” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
750	kerberos-iv	The service name “kerberos-iv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
765	webster	The service name “webster” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
767	phonebook	The service name “phonebook” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
873	rsync	rsync file synchronization service.
992	telnets	The service name “telnets” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
993	imaps	IMAP mailbox access with implicit TLS.
994	ircs	The service name “ircs” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
995	pop3s	POP3 mailbox retrieval with implicit TLS.

2. Traditional UNIX service ports

Port / transport	Service name	Current guidance
512/tcp	exec	The service name “exec” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
512/udp	biff[comsat]	The service name “biff[comsat]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
513/tcp	login	The service name “login” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
513/udp	who[whod]	The service name “who[whod]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
514/tcp	shell[cmd]	Syslog over UDP, or the legacy remote-shell service over TCP; transport matters.
514/udp	syslog	Syslog over UDP, or the legacy remote-shell service over TCP; transport matters.
515	printer[spooler]	The service name “printer[spooler]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
517/udp	talk	The service name “talk” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
518/udp	ntalk	The service name “ntalk” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
519	utime[unixtime]	The service name “utime[unixtime]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
520/tcp	efs	The service name “efs” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
520/udp	router[route,routed]	The service name “router[route,routed]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
521	ripng	The service name “ripng” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
525	timed[timeserver]	The service name “timed[timeserver]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
526/tcp	tempo[newdate]	The service name “tempo[newdate]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
530/tcp	courier[rpc]	The service name “courier[rpc]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
531/tcp	conference[chat]	The service name “conference[chat]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
532	netnews	The service name “netnews” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
533/udp	netwall	The service name “netwall” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
540/tcp	uucp[uucpd]	The service name “uucp[uucpd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
543/tcp	klogin	The service name “klogin” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
544/tcp	kshell	The service name “kshell” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
548	afpovertcp	The service name “afpovertcp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
556	remotefs[rfs_server,rfs]	The service name “remotefs[rfs_server,rfs]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.

3. Registered user ports

Port / transport	Service name	Current guidance
1080	socks	SOCKS proxy service.
1236	bvcontrol[rmtcfg]	The service name “bvcontrol[rmtcfg]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1300	h323hostcallsc	The service name “h323hostcallsc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1433	ms-sql-s	Microsoft SQL Server database service.
1434	ms-sql-m	The service name “ms-sql-m” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1494	ica	The service name “ica” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1512	wins	The service name “wins” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1524	ingreslock	The service name “ingreslock” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1525	prospero-np	The service name “prospero-np” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1645	datametrics[old-radius]	The service name “datametrics[old-radius]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1646	sa-msg-port[oldradacct]	The service name “sa-msg-port[oldradacct]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1649	kermit	The service name “kermit” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1701	l2tp[l2f]	L2TP tunneling control traffic; encryption normally comes from IPsec.
1718	h323gatedisc	The service name “h323gatedisc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1719	h323gatestat	The service name “h323gatestat” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1720	h323hostcall	The service name “h323hostcall” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1758	tftp-mcast	The service name “tftp-mcast” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1759	mtftp	The service name “mtftp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1789	hello	The service name “hello” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1812	radius	RADIUS authentication and authorization.
1813	radius-acct	RADIUS accounting.
1911	mtp	The service name “mtp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1985	hsrp	The service name “hsrp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1986	licensedaemon	The service name “licensedaemon” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1997	gdp-port	The service name “gdp-port” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2049	nfs[nfsd]	Network File System (NFS).
2102	zephyr-srv	The service name “zephyr-srv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2103	zephyr-clt	The service name “zephyr-clt” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2104	zephyr-hm	The service name “zephyr-hm” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2401	cvspserver	The service name “cvspserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2430/tcp	venus	The service name “venus” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2430/udp	venus	The service name “venus” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2431/tcp	venus-se	The service name “venus-se” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2431/udp	venus-se	The service name “venus-se” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2432/udp	codasrv	The service name “codasrv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2433/tcp	codasrv-se	The service name “codasrv-se” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2433/udp	codasrv-se	The service name “codasrv-se” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2600	hpstgmgr[zebrasrv]	The service name “hpstgmgr[zebrasrv]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2601	discp-client[zebra]	The service name “discp-client[zebra]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2602	discp-server[ripd]	The service name “discp-server[ripd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2603	servicemeter[ripngd]	The service name “servicemeter[ripngd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2604	nsc-ccs[ospfd]	The service name “nsc-ccs[ospfd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2605	nsc-posa	The service name “nsc-posa” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2606	netmon[ospf6d]	The service name “netmon[ospf6d]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2809	corbaloc	The service name “corbaloc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
3130	icpv2	The service name “icpv2” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
3306	mysql	MySQL database service.
3346	trnsprntproxy	The service name “trnsprntproxy” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
4011	pxe	The service name “pxe” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
4321	rwhois	The service name “rwhois” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
4444	krb524	The service name “krb524” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5002	rfe	The service name “rfe” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5308	cfengine	The service name “cfengine” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5999	cvsup[CVSup]	The service name “cvsup[CVSup]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
6000	x11[X]	The service name “x11[X]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7000	afs3-fileserver	The service name “afs3-fileserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7001	afs3-callback	The service name “afs3-callback” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7002	afs3-prserver	The service name “afs3-prserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7003	afs3-vlserver	The service name “afs3-vlserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7004	afs3-kaserver	The service name “afs3-kaserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7005	afs3-volser	The service name “afs3-volser” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7006	afs3-errors	The service name “afs3-errors” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7007	afs3-bos	The service name “afs3-bos” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7008	afs3-update	The service name “afs3-update” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7009	afs3-rmtsys	The service name “afs3-rmtsys” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
9876	sd	The service name “sd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
10080	amanda	The service name “amanda” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
11371	pgpkeyserver	The service name “pgpkeyserver” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
11720	h323callsigalt	The service name “h323callsigalt” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13720	bprd	The service name “bprd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13721	bpdbm	The service name “bpdbm” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13722	bpjava-msvc	The service name “bpjava-msvc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13724	vnetd	The service name “vnetd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13782	bpcd	The service name “bpcd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
13783	vopied	The service name “vopied” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
22273	wnn6[wnn4]	The service name “wnn6[wnn4]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
26000	quake	The service name “quake” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
26208	wnn6-ds	The service name “wnn6-ds” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
33434	traceroute	The service name “traceroute” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
Registry note: aliases in /etc/services can differ from the current IANA primary service name. Treat the local services file as configuration data, not as proof of which application is using a port.

4. AppleTalk DDP ports (legacy)

Port / transport	Service name	Current guidance
1/ddp	rtmp	The service name “rtmp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2/ddp	nbp	The service name “nbp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
4/ddp	echo	The service name “echo” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
6/ddp	zip	The service name “zip” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.

5. Kerberos-related ports

Port / transport	Service name	Current guidance
751	kerberos_master	The service name “kerberos_master” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
752	passwd_server	The service name “passwd_server” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
754	krb5_prop	The service name “krb5_prop” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
760	krbupdate[kreg]	The service name “krbupdate[kreg]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1109	kpop	The service name “kpop” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2053	knetd	The service name “knetd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2105	eklogin	The service name “eklogin” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.

6. Vendor, private, or historically used ports

Port / transport	Service name	Current guidance
15/tcp	netstat	The service name “netstat” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
98/tcp	linuxconf	The service name “linuxconf” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
106	poppassd	The service name “poppassd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
465/tcp	smtps	The service name “smtps” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
616/tcp	gii	The service name “gii” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
808	omirr[omirrd]	The service name “omirr[omirrd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
871/tcp	supfileserv	The service name “supfileserv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
901/tcp	swat	The service name “swat” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
953	rndc	The service name “rndc” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1127	sufiledbg	The service name “sufiledbg” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1178/tcp	skkserv	The service name “skkserv” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1313/tcp	xtel	The service name “xtel” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
1529/tcp	support[prmsd,gnatsd]	The service name “support[prmsd,gnatsd]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2003/tcp	cfinger	The service name “cfinger” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2150	ninstall	The service name “ninstall” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
2988	afbackup	The service name “afbackup” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
3128/tcp	squid	The service name “squid” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
3455	prsvp	The service name “prsvp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5432	postgres	PostgreSQL database service.
4557/tcp	fax	The service name “fax” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
4559/tcp	hylafax	The service name “hylafax” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5232	sgi-dgl	The service name “sgi-dgl” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5354	noclog	The service name “noclog” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5355	hostmon	The service name “hostmon” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
5680/tcp	canna	The service name “canna” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
6010/tcp	x11-ssh-offset	The service name “x11-ssh-offset” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
6667	ircd	The service name “ircd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7100/tcp	xfs	The service name “xfs” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
7666/tcp	tircproxy	The service name “tircproxy” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
8008	http-alt	The service name “http-alt” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
8080	webcache	Common alternate HTTP or application-proxy port; use is application-specific.
8081	tproxy	The service name “tproxy” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
9100/tcp	jetdirect[laserjet,hplj]	The service name “jetdirect[laserjet,hplj]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
9359	mandelspawn[mandelbrot]	The service name “mandelspawn[mandelbrot]” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
10081	kamanda	The service name “kamanda” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
10082/tcp	amandaidx	The service name “amandaidx” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
10083/tcp	amidxtape	The service name “amidxtape” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
20011	isdnlog	The service name “isdnlog” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
20012	vboxd	The service name “vboxd” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
22305/tcp	wnn4_Kr	The service name “wnn4_Kr” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
22289/tcp	wnn4_Cn	The service name “wnn4_Cn” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
22321/tcp	wnn4_Tw	The service name “wnn4_Tw” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
24554	binkp	The service name “binkp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
27374	asp	The service name “asp” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
60177	tfido	The service name “tfido” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.
60179	fido	The service name “fido” is registered or historically associated with this port. Verify the current IANA record and the actual application traffic before allowing access.