Ports 65536
Gültige Portnummern 0 – 65535
Priviliegierte / Well Known Ports 0 – 1023
„Freie Ports“ 1024 – 65535
Registrierte Ports: 1024 – 49151
Dynamische Ports: 49152 – 65535
| Portnummer | Beschreibung |
| 20 | FTP (DATA) |
| 21 | FTP |
| 22 | SSH |
| 23 | Telnet |
| 25 | SMTP |
| 37 | TIME |
| 43 | WHOIS |
| 53 | DNS |
| 67 – 68 | DHCP / BOOTP |
| 69 | TFTP (Trivial File Transfer) |
| 79 | Finger |
| 80 | HTTP Server |
| 110 | POP3 |
| 118 | SQL |
| 119 | NNTP |
| 123 | NTP |
| 137 | NETBIOS NAME SERVICE |
| 138 | NETBIOS DATAGRAMM SERVICE |
| 139 | NETBIOS SESSION SERVICE |
| 143 | IMAP |
| 161 162 | SNMP |
| 179 | Border Gateway Protocol |
| 194 | Internet Relay Chat Protocol |
| 389 | LDAP |
| 443 | HTTPS |
| 465 | SMTPS |
| 500 | Key Exchange for IPSEC |
| 546 – 547 | DHCP v6 |
| 587 | SMTP |
| 989 – 990 | FTP over SSL |
| 993 | IMAPS |
| 995 | POP3S |