The following lists discuss the most important ports and the server services that belong to them, and the different types of ICMP messages. Client programs usually use ports between 1024 and 65535.
There are also lists over Internet protocols, reserved IP addresses and a mapping between netmasks and IP address intervals.
This is a list of important ports. See /etc/services and http://www.iana.org/.
| Name | Port/protocol | Description |
|---|---|---|
| echo | 7/tcp | |
| echo | 7/udp | |
| discard | 9/tcp | sink null |
| discard | 9/udp | sink null |
| systat | 11/tcp | users |
| daytime | 13/tcp | |
| daytime | 13/udp | |
| netstat | 15/tcp | |
| qotd | 17/tcp | quote |
| chargen | 19/tcp | ttytst source |
| chargen | 19/udp | ttytst source |
| ftp-data | 20/tcp | ftp data transfer |
| ftp | 21/tcp | ftp command |
| ssh | 22/tcp | Secure Shell |
| telnet | 23/tcp | |
| smtp | 25/tcp | |
| time | 37/tcp | timeserver |
| time | 37/udp | timeserver |
| rlp | 39/udp | resource location |
| nicname | 43/tcp | who is |
| domain | 53/tcp | domain name server |
| domain | 53/udp | domain name server |
| sql*net | 66/tcp | Oracle SQL*net |
| sql*net | 66/udp | Oracle SQL*net |
| bootps | 67/tcp | bootp server |
| bootps | 67/udp | bootp server |
| bootpc | 68/tcp | bootp client |
| bootpc | 68/udp | bootp client |
| tftp | 69/tcp | Trivial File Transfer |
| tftp | 69/udp | Trivial File Transfer |
| gopher | 70/tcp | gopher server |
| finger | 79/tcp | Finger |
| www-http | 80/tcp | WWW |
| www-http | 80/udp | WWW |
| kerberos | 88/tcp | Kerberos |
| kerberos | 88/udp | Kerberos |
| pop2 | 109/tcp | PostOffice V.2 |
| pop3 | 110/tcp | PostOffice V.3 |
| sunrpc | 111/tcp | RPC 4.0 portmapper |
| sunrpc | 111/udp | RPC 4.0 portmapper |
| auth/ident | 113/tcp | Authentication Service |
| auth | 113/udp | Authentication Service |
| audionews | 114/tcp | Audio News Multicast |
| audionews | 114/udp | Audio News Multicast |
| nntp | 119/tcp | Usenet Network News Transfer |
| nntp | 119/udp | Usenet Network News Transfer |
| ntp | 123/tcp | Network Time Protocol |
| ntp | 123/udp | Network Time Protocol |
| netbios-ns | 137/tcp | NETBIOS Name Service |
| netbios-ns | 137/udp | NETBIOS Name Service |
| netbios-dgm | 138/tcp | NETBIOS Datagram Service |
| netbios-dgm | 138/udp | NETBIOS Datagram Service |
| netbios-ssn | 139/tcp | NETBIOS Session Service |
| netbios-ssn | 139/udp | NETBIOS Session Service |
| imap | 143/tcp | Internet Message Access Protocol |
| imap | 143/udp | Internet Message Access Protocol |
| sql-net | 150/tcp | SQL-NET |
| sql-net | 150/udp | SQL-NET |
| sqlsrv | 156/tcp | SQL Service |
| sqlsrv | 156/udp | SQL Service |
| snmp | 161/tcp | |
| snmp | 161/udp | |
| snmp-trap | 162/tcp | |
| snmp-trap | 162/udp | |
| cmip-man | 163/tcp | CMIP/TCP Manager |
| cmip-man | 163/udp | CMIP |
| cmip-agent | 164/tcp | CMIP/TCP Agent |
| cmip-agent | 164/udp | CMIP |
| irc | 194/tcp | Internet Relay Chat |
| irc | 194/udp | Internet Relay Chat |
| at-rtmp | 201/tcp | AppleTalk Routing Maintenance |
| at-rtmp | 201/udp | AppleTalk Routing Maintenance |
| at-nbp | 202/tcp | AppleTalk Name Binding |
| at-nbp | 202/udp | AppleTalk Name Binding |
| at-3 | 203/tcp | AppleTalk |
| at-3 | 203/udp | AppleTalk |
| at-echo | 204/tcp | AppleTalk Echo |
| at-echo | 204/udp | AppleTalk Echo |
| at-5 | 205/tcp | AppleTalk |
| at-5 | 205/udp | AppleTalk |
| at-zis | 206/tcp | AppleTalk Zone Information |
| at-zis | 206/udp | AppleTalk Zone Information |
| at-7 | 207/tcp | AppleTalk |
| at-7 | 207/udp | AppleTalk |
| at-8 | 208/tcp | AppleTalk |
| at-8 | 208/udp | AppleTalk |
| ipx | 213/tcp | |
| ipx | 213/udp | |
| imap3 | 220/tcp | Interactive Mail Access Protocol v3 |
| imap3 | 220/udp | Interactive Mail Access Protocol v3 |
| aurp | 387/tcp | AppleTalk Update-Based Routing |
| aurp | 387/udp | AppleTalk Update-Based Routing |
| netware-ip | 396/tcp | Novell Netware over IP |
| netware-ip | 396/udp | Novell Netware over IP |
| rmt | 411/tcp | Remote mt |
| rmt | 411/udp | Remote mt |
| microsoft-ds | 445/tcp | |
| microsoft-ds | 445/udp | |
| isakmp | 500/udp | ISAKMP/IKE |
| fcp | 510/tcp | First Class Server |
| exec | 512/tcp | BSD rexecd(8) |
| comsat/biff | 512/udp | used by mail system to notify users |
| login | 513/tcp | BSD rlogind(8) |
| who | 513/udp | whod BSD rwhod(8) |
| shell | 514/tcp | cmd BSD rshd(8) |
| syslog | 514/udp | BSD syslogd(8) |
| printer | 515/tcp | spooler BSD lpd(8) |
| printer | 515/udp | Printer Spooler |
| talk | 517/tcp | BSD talkd(8) |
| talk | 517/udp | talk |
| ntalk | 518/udp | New Talk (ntalk) |
| ntalk | 518/udp | SunOS talkd(8) |
| netnews | 532/tcp | readnews |
| uucp | 540/tcp | uucpd BSD uucpd(8) |
| uucp | 540/udp | uucpd BSD uucpd(8) |
| klogin | 543/tcp | Kerberos Login |
| klogin | 543/udp | Kerberos Login |
| kshell | 544/tcp | Kerberos Shell |
| kshell | 544/udp | Kerberos Shell |
| ekshell | 545/tcp | krcmd Kerberos encrypted remote shell -kfall |
| pcserver | 600/tcp | ECD Integrated PC board srvr |
| mount | 635/udp | NFS Mount Service |
| pcnfs | 640/udp | PC-NFS DOS Authentication |
| bwnfs | 650/udp | BW-NFS DOS Authentication |
| flexlm | 744/tcp | Flexible License Manager |
| flexlm | 744/udp | Flexible License Manager |
| kerberos-adm | 749/tcp | Kerberos Administration |
| kerberos-adm | 749/udp | Kerberos Administration |
| kerberos | 750/tcp | kdc Kerberos authentication--tcp |
| kerberos | 750/udp | Kerberos |
| kerberos_master | 751/udp | Kerberos authentication |
| kerberos_master | 751/tcp | Kerberos authentication |
| krb_prop | 754/tcp | Kerberos slave propagation |
| 999/udp | Applixware | |
| socks | 1080/tcp | |
| socks | 1080/udp | |
| kpop | 1109/tcp | Pop with Kerberos |
| ms-sql-s | 1433/tcp | Microsoft SQL Server |
| ms-sql-s | 1433/udp | Microsoft SQL Server |
| ms-sql-m | 1434/tcp | Microsoft SQL Monitor |
| ms-sql-m | 1434/udp | Microsoft SQL Monitor |
| pptp | 1723/tcp | pptp |
| pptp | 1723/udp | pptp |
| nfs | 2049/tcp | Network File System |
| nfs | 2049/udp | Network File System |
| eklogin | 2105/tcp | Kerberos encrypted rlogin |
| rkinit | 2108/tcp | Kerberos remote kinit |
| kx | 2111/tcp | X over Kerberos |
| kauth | 2120/tcp | Remote kauth |
| lyskom | 4894/tcp | LysKOM (conference system) |
| sip | 5060/tcp | Session Initiation Protocol |
| sip | 5060/udp | Session Initiation Protocol |
| x11 | 6000-6063/tcp | X Window System |
| x11 | 6000-6063/udp | X Window System |
| irc | 6667/tcp | Internet Relay Chat |
| afs | 7000-7009/tcp | |
| afs | 7000-7009/udp |