| TCPMUX | 1 | TCP Port Service Multiplexer |
| TCP Port Service Multiplexer | 1 | TCP Port Service Multiplexer |
| Echo | 7 | Echo |
| Discard | 9 | Discard |
| systat | 11 | Active Users |
| daytime | 13 | Daytime |
| qotd | 17 | Quote of the Day |
| chargen | 19 | Character Generator |
| FTP Data | 20 | File Transfer [Default Data] |
| FTP | 21 | File Transfer [Control] |
| SSH | 22 | Secure Shell (SSH) |
| Telnet | 23 | Telnet |
| SMTP | 25 | Simple Mail Transfer Protocol (SMTP) |
| time | 37 | Time |
| rlp | 39 | Resource Location Protocol |
| NIC Host Name | 42 | Host Name Server |
| WHOIS | 43 | WHOIS |
| MTP | 57 | Mail Transfer Protocol |
| TACACS-DS | 65 | TACACS-Database Service |
| DNS | 53 | Domain Name System (DNS) |
| Bootps | 67 | Bootstrap Protocol Server |
| DHCP | 67 | DHCP-Server läuft auf diesem Port und wartet auf Anfragen von Clients. |
| Bootpc | 68 | Bootstrap Protocol Client |
| DHCP | 68 | DHCP-Clients senden ihre Anfragen normalerweise an diesen Port. |
| TFTP | 69 | Trivial File Transfer Protocol (TFTP) |
| gopher | 70 | Gopher |
| rje | 77 | Remote Job Entry |
| Finger | 79 | Finger |
| http | 80 | Hypertext Transfer Protocol (HTTP) |
| Kerberos | 88 | Kerberos |
| pop3 | 110 | Post Office Protocol - Version 3 (POP3) |
| NTP | 123 | Network Time Protocol (NTP) |
| NetBIOS | 137 | NetBIOS Name Service |
| NetBIOS | 138 | NetBIOS Datagram Service |
| NetBIOS | 139 | NetBIOS Session Service |
| IMAP4 | 143 | Internet Message Access Protocol (IMAP) |
| SNMP | 161 | Simple Network Management Protocol (SNMP) |
| SNMP Trap | 162 | SNMP Trap (SNMPTRAP) |
| bgp | 179 | Border Gateway Protocol (BGP) |
| ldap | 389 | Lightweight Directory Access Protocol (LDAP) |
| https | 443 | HTTP Secure (HTTPS) |
| Microsoft-DS | 445 | Microsoft-DS |
| exec | 512 | Remote Process Execution |
| login | 513 | Remote Login |
| shell | 514 | Remote Shell |
| printer | 515 | Printer |
| talk | 517 | Talk |
| ntalk | 518 | Unix Time Stamp |
| utime | 519 | Unix Time Stamp |
| efs | 520 | Extended File Name Server |
| timed | 525 | Timed |
| tempo | 526 | Newdate |
| courier | 530 | Courier |
| conference | 531 | Conference |
| netnews | 532 | Netnews |
| uucp | 540 | UUCP |
| klogin | 543 | Kerberos Login |
| kshell | 544 | Kerberos Shell |
| kerberos-adm | 749 | Kerberos administration |
| nntp | 119 | Network News Transfer Protocol (NNTP) |
| irc | 194 | Internet Relay Chat (IRC) |
| POP3S | 995 | Post Office Protocol 3 over TLS/SSL (POP3S) |
| IMAPS | 993 | Internet Message Access Protocol over TLS/SSL (IMAPS) |
| LDAPS | 636 | Lightweight Directory Access Protocol over TLS/SSL (LDAPS) |
| telnets | 992 | Telnet over TLS/SSL |
| submission | 587 | Message Submission |
| syslog | 514 | Remote Syslog |
| uucp-path | 117 | UUCP Path Service |
| tcpwrapped | 7 | TCP Wrapped Services |