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Port Numbers
Important Port Numbers
| Question | Answer |
|---|---|
| Port 20 | FTP Data Port |
| Port 21 | FTP Control Port |
| Port 23 | Telnet |
| Port 25 | SMTP |
| Port 53 UDP | DNS Name Queries |
| Port 53 TCP | DNS Zone Transfers |
| Port 67 | DHCP Client |
| Port 68 | DHCP Server |
| Port 69 | TFTP |
| Port 80 | HTTP |
| Port 110 | POP3 |
| Port 135 | RPC (Windows File Sharing) |
| Port 137 | NetBIOS (Windows File Sharing) |
| Port 138 | NetBIOS (Windows File Sharing) |
| Port 139 | NetBIOS (Windows File Sharing) |
| Port 143 | IMAP |
| Port 161 | SNMP |
| Port 162 | SNMP Trap |
| Port 389 | LDAP |
| Port 443 | HTTPS |
| Port 445 | SMB |
| Port 636 | LDAP TLS/SSL |
| Port 993 | IMAP TLS/SSL |
| Port 1723 | PPTP |
| Port 49 | TACACS+ |
| Port 500 | IPsec |
| Port 1433 | Microsoft SQL Server |
| Port 995 | POP SSL/TLS |
| Port 123 | NTP/SNTP - Network Time Protocol |
| Port 1701 | L2TP |
| Port 22 | SSH/SFTP/SCP |
| Port 88 | Kerberos |
| Port 3389 | RDP |
| Port 465 | SMTPS |
| Port 1433 | Microsoft SQL Server |
| Port 515 | LPR/LPD |
| Port 1521 | Oracle |
| Port 1720 | H.323 |
| Port 9100 | HP JetDirect Printing |