| FTP | TCP: 21 |
| SSH | TCP: 22 |
| Telnet | TCP: 23 |
| SMTP | TCP: 25 |
| DNS-Auflösung | TCP: 53 UDP: 53 |
| DHCP-Lease | UDP: 67,68 |
| HTTP | TCP: 80 |
| POP3 | TCP: 110 |
| NNTP (Network News Transfer Protocol) | TCP: 119 |
| DHCP-Manager | TCP: 135 |
| Windows-Druckerfreigabe | TCP: 139 UDP: 137, 138 |
| Netzwerkfreigaben / Windows-Dateifreigaben | TCP: 139 |
| Event-Anzeige / Event-Dienst | TCP: 139 |
| IMAP | TCP: 143 |
| SNMP | UDP: 161 |
| Active Directory (LDAP) | TCP: 389 |
| HTTPS | TCP: 443 |
| SMTPS (SSL) | TCP: 465 |
| IPSec | UDP: 500 (IKE) IP Protokoll: 50 (ESP), 51 (AH) |
| LPD (TCP/IP Print Server) | TCP: 515 |
| SMTP (Submission) | TCP: 587 |
| Internet Printing Protocol (IPP) | TCP: 631 |
| Active Directory (LDAP-SSL) | TCP: 636 |
| IMAP (SSL) | TCP: 993 |
| POP3 (SSL) | TCP: 995 |
| Microsoft Terminal-Server: Citrix-Client | TCP: 1494 |
| Layer2 Tunneling Protocol (L2TP) | UDP: 1701 |
| Point-to-Point Tunneling Protocol (PPTP) | TCP: 1723 IP Protokoll: 47 (GRE) |
| MMS (Windows Media Services) | TCP, UDP: 1755 |
| Proxy (Squid) | TCP: 3128 |
| NetMeeting (Remote-Desktop-Freigabe) | TCP: 3389 |
| Microsoft Terminal-Server: RDP-Client | TCP: 3389 |
| ICQ | TCP: 5190 |
| Proxy (alternativ, z.B. YaCy) | TCP: 8080 |
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