| A | B |
|---|
| 20 | File Transfer Protocol (FTP) |
| 21 | File Transfer Protocol (FTP) |
| 22 | Secure Shell (SSH) |
| 23 | Telnet |
| 25 | Simple Mail Transfer Protocol (SMTP) |
| 53 | Domanin Name Service (DNS) |
| 69 | Trivial File Transfer Protocol (TFTP) |
| 80 | Hypertext Transfer Protocol (HTTP) |
| 110 | Post Office Protocol Version 3 (POP3) |
| 119 | Network News Transport Protocol (NNTP) |
| 123 | Network Time Protocol (NTP) |
| 143 | Internet Message Access Protocol Version 4 (IMAP4) |
| 443 | Hypertext Transfer Protocol Secure (HTTPS) |
