by Here is a list of common TCP/IP ports for reference when conducting a penetration test:
Common TCP/IP Ports
| Port | Type | Usage |
| 20 | TCP | FTP Data |
| 21 | TCP | FTP Control |
| 22 | TCP|UDP | Secure Shell (SSH) |
| 23 | TCP | Telnet |
| 25 | TCP | Simple Mail Transfer Protocol (SMTP) |
| 42 | TCP|UDP | Windows Internet Name Service (WINS) |
| 53 | TCP|UDP | Domain Name System (DNS) |
| 67 | UDP | DHCP Server |
| 68 | UDP | DHCP Client |
| 69 | UDP | Trivial File Transfer Protocol |
| 80 | TCP|UDP | Hypertext Transfer Protocol (HTTP) |
| 110 | TCP | Post Office Protocol (POP3) | 119 | TCP | Network News Transfer Protocol (NNTP) | 123 | TCP | Network Time Protocol (NTP) | 135 | TCP|UDP | Microsoft RPC | 137 | TCP|UDP | NetBIOS Name Service | 138 | TCP|UDP | NetBIOS Datagram Service | 139 | TCP|UDP | NetBIOS Session Service | 143 | TCP|UDP | Internet Message Access Protocol (IMAP) | 161 | TCP|UDP | Simple Network Management Protocol (SNMP) | 162 | TCP|UDP | Simple Network Management Protocol (SNMP) Trap | 389 | TCP|UDP | Lightweight Directory Access Protocol (LDAP) | 443 | TCP|UDP | Hypertext Transfer Protocol over TLS/SSL (HTTPS) | 445 | TCP | Server Message Block (SMB) | 636 | TCP|UDP | Lightweight Directory Access Protocol over TLS/SSL (LDAPS) | 873 | TCP | Remote File Synchronization Protocol (rsync) | 993 | TCP | Internet Message Access Protocol over SSL (IMAPS) | 995 | TCP | Post Office Protocol 3 over TLS/SSL (POP3S) | 1433 | TCP | Microsoft SQL Server Database | 3306 | TCP | MySQL Database | 3389 | TCP | Microsoft Terminal Server/Remote Desktop Protocol (RDP) | 5800 | TCP | Virtual Network Computing (VNC) Web Interface | 5900 | TCP | Virtual Network Computing (VNC) Remote Desktop |
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