List of the best known TCP / IP ports
| PORT | SERVICE | PROTOCOL | DESCRIPTION |
|---|---|---|---|
| 20 | ftp-data | TCP/UDP | File Transfer Data |
| 21 | ftp | TCP/UDP | File Transfer Control |
| 22 | ssh | TCP | SSH Remote Login Protocol |
| 23 | telnet | TCP | Telnet |
| 25 | smtp | TCP | Simpler Mail Transfer Protocol |
| 53 | domain | TCP/UDP | Domain Name Server |
| 80 | http | TCP | Hypertext Transfer Protocol |
| 102 | iso-tsap | TCP/UDP | X.400, ISO-TSAP Class 0 |
| 110 | pop3 | TCP | Post Office Protocol 3 |
| 119 | nntp | TCP | Network News Transfer Protocol |
| 135 | loc-srv/epmap | TCP/UDP | MS DCE RPC end-point mapper |
| 137 | netbios-ns | TCP/UDP | Netbios Name Service |
| 138 | netbios-dgm | TCP/UDP | Netbios Datagram Service |
| 139 | netbios-ssn | TCP/UDP | Netbios Session Service |
| 143 | imap4 | TCP | Interner Message Access Protocol 4 |
| 389 | ldap | TCP | Lightweight Directory Access Protocol |
| 443 | ssl | TCP | Hypertext Transfer Protocol over TLS/SSL |
| 445 | microsoft-ds | TCP/UDP | Windows 2000/XP SMB |
| 554 | rtsp | TCP | Real Time Stream Control Protocol |
| 636 | sldap | TCP | Lightweight Directory Access Protocol over SSL |
| 993 | imaps | TCP | Internet Message Access Protocol 4 over TLS/SSL |
| 995 | pop3s | TCP | Post Office Protocol 3 over TLS/SSL |
| 1214 | kazaa | TCP | Kazaa / Morpheus |
| 1433 | ms-sql-s | TCP/UDP | Microsoft SQL Server |
| 1434 | ms-sql-m | UDP | Microsoft SQL Monitor |
| 1755 | ms-streaming | TCP/UDP | Microsoft Media Player |
| 1863 | msnp | TCP | Microsoft MSN Messenger |
| 3112 | ksysguard | TCP/UDP | KDE System Guard |
| 3185 | smpppd | TCP/UDP | SuSE Meta PPPD |
| 4000 | icq | TCP/UDP | ICQ/Terabase |
| 4661 | TCP | eDonkey | |
| 4662 | TCP | eDonkey | |
| 4665 | UDP | eDonkey | |
| 5050 | mmc | TCP | Multimedia Conference Control Tool |
| 5060 | sip | TCP/UDP | SIP |
| 5190 | aol | TCP | AOL Instant Messenger / Mirabilis ICQ |
| 6346 | gnutella-svc | TCP | Gnutella |
| 6347 | gnutella-rtr | TCP | Gnutella |
| 7070 | arcp | TCP | Realplayer Server |
| 7071 | arcp | TCP | Realplayer Server |