| Dienst für Well-known | Port | Protokoll | Beschreibung |
| echo | 7 | TCP | Echo |
| ftp-data | 20 | TCP/UDP | File Transfer (Default Data) |
| ftp | 21 | TCP/UDP | File Transfer (Control) |
| ssh | 22 | TCP | SSH Remote Login Protocol |
| telnet | 23 | TCP | Telnet |
| smtp | 25 | TCP | Simple Mail Transfer |
| time | 37 | TCP | Time |
| name / nameserver | 42 | TCP | Host Name Server |
| domain | 53 | TCP/UDP | Domain Name Server |
| gopher | 70 | TCP | Gopher |
| finger | 79 | TCP | Finger |
| http | 80 | TCP | Hypertext Transfer Protocol (www) |
| iso-tsap | 102 | TCP/UDP | X.400, ISO-TSAP Class 0 |
| pop2 | 109 | TCP | Post Office Protocol - Version 2 |
| pop3 | 110 | TCP | Post Office Protocol - Version 3 |
| nntp | 119 | TCP | Network News Transfer Protocol |
| ntp | 123 | TCP | Network Time Protocol |
| loc-srv/epmap | 135 | TCP/UDP | MS DCE RPC end-point mapper |
| netbios-ns | 137 | TCP/UDP | Netbios Name Service |
| netbios-dgm | 138 | TCP/UDP | Netbios Datagram Service |
| netbios-ssn | 139 | TCP/UDP | Netbios Session Service |
| imap4 | 143 | TCP | Internet Message Access Protocol Vers. 4 |
| snmp | 161 | TCP | SNMP |
| irc | 194 | TCP | Internet Relay Chat Protocol |
| imap3 | 220 | TCP | Interactive Mail Access Protokol 3 |
| nsiiops | 261 | TCP | IIOP Name Service über TLS / SSL |
| ldap | 389 | TCP | Lightweight Directory Access Protocol |
| https / ssl | 443 | TCP | http Protocol über TLS / SSL |
| microsoft-ds | 445 | TCP/UDP | Microsoft-DS (Win2000/XP SMB) |
| ddm-ssl | 448 | TCP | DDM-SSL |
| smtps | 465 | TCP | smtp Protocol über TLS / SSL |
| rtsp | 554 | TCP | Real Time Stream Control Protocol |
| nntps | 563 | TCP | nntp Protocol über TLS / SSL |
| sshell | 614 | TCP | SSLshell |
| ldaps (sldap) | 636 | TCP | ldap Protocol über TLS / SSL |
| ftps-data | 989 | TCP | ftp Protocol, Data, über TLS / SSL |
| ftps | 990 | TCP | ftp Protocol, Control, über TLS / SSL |
| telnets | 992 | TCP | telnet Protocol über TLS / SSL |
| imaps | 993 | TCP | imap4 Protocol über TLS /SSL |
| ircs | 994 | TCP | irc Protocol über TLS / SSL |
| pop3s | 995 | TCP | pop3 Protocol über TLS / SSL |