Linux: Standard Ports
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Standard Ports
| Port | Service |
| 21 | File Transfer Protocol (FTP) |
| 22 | Secure Shell (SSH) |
| 23 | Telnet |
| 25 | Simple Mail Transfer Protocol (SMTP) |
| 53 | Domain Name Service Servers (DNS) |
| 80 | HTTP |
| 88 | Kerberos |
| 110 | Post Office Protocol (POP3) |
| 139 | Network Basic Input/Output System (NetBIOS) session Service |
| 143 | Internet Mail Access Protocol (IMAP) |
| 144 | Secure HTTP (HTTPs) |