Port Numbers Cheat Sheet
| Port # | Type | Protocol | Description |
|---|---|---|---|
| 20 | TCP | FTP | File Transfer Protocol - data |
| 21 | TCP | FTP | File Transfer Protocol - control |
| 22 | TCP/UDP | SSH | Secure Shell for secure login Secure FTP (SFTP for file transfer) Secure Copy Protocol (SCP for file transfer) |
| 23 | TCP | Telnet | Unencrypted login |
| 25 | TCP | SMTP | Simple Mail Transfer Protocol (send) |
| 49 | TCP | TACACS+ | Terminal Access Controller Access Control System |
| 53 | TCP/UDP | DNS | Domain Name Server |
| 67,68 | UDP | DHCP | Dynamic Host Configuration Protocol |
| 69 | UDP | TFTP | Trivial File Transfer Protocol (no auth.) |
| 80 | TCP | HTTP | HyperText Transfer Protocol |
| 110 | TCP | POP3 | Post Office Protocol v3 (receive) |
| 112 | IP | VRRP | Virtual Router Redundancy Protocol |
| 123 | UDP | NTP | Network Time Protocol |
| 137,139 | TCP/UDP | NetBIOS | Network Basic Input/Output System (share files) |
| 143 | TCP | IMAP | Internet Message Access Protocol |
| 161,162 | TCP/UDP | SNMP | Simple Network Management Protocol |
| 389 | TCP/UDP | LDAP | Lightweight Directory Access Protocol |
| 443 | TCP/UDP | HTTPS | HTTP With Secure Socket Layer (SSL) |
| 445 | TCP/UDP | SMB | Server Message Block (share files) |
| 514 | TCP/UDP | Syslog | System log messages (0-7) |
| 587 | TCP | SMTPS | SMTP Secure with SSL/TLS |
| 636 | TCP/UDP | LDAPS | LDAP Secure |
| 853 | TCP | DoT | DNS over TLS |
| 990 | TCP | FTPS | File Transfer Protocol over SSL/TLS - control |
| 993 | TCP | IMAPS | IMAP Secure over SSL/TLS |
| 995 | TCP | POP3(S) | Post Office Protocol version 3 over SSL (POP3 over SSL) |
| 989 | TCP | FTPS | File Transfer Protocol over SSL/TLS - data |
| 1433 | TCP/UDP | Mic. SQL | Microsoft Structured Query Language |
| 1521 | TCP/UDP | SQLnet | Oracle Structured Query Language |
| 1546, 1645 | UDP | RADIUS | Remote Authentication Dial-In User Service (Legacy) |
| 1719 | UDP | H.323 | Call signaling and registration (alternate communication) |
| 1720 | TCP | H.323 | Call signaling and control, multimedia transport and control |
| 1812, 1813 | UDP | RADIUS | Remote Authentication Dial-In User Service |
| 3306 | TCP | MySQL | Open Source Structured Query Language |
| 3389 | TCP/UDP | RDP | Remote Desktop Protocol |
| 5060, 5061 | TCP/UDP | SIP | Session Initiation Protocol (used for VoIP) |
| 16384-32767 (range) | UDP | RTP and RTCP | Real-time Transport Protocol and RTP Control Protocol (each session uses a pair of ports) |