| A | B |
|---|
| 20 | File Transfer Protocol (FTP) - Data |
| 21 | File Transfer Protocol (FTP) - Control |
| 23 | Telnet |
| 25 | Simple Mail Transfer Protocol (SMTP) |
| 53 | Domain Name System (DNS) |
| 80 | Hypertext Transfer Protocol (HTTP) |
| 110 | Post Office Protocol (POP3) |
| 143 | Interim Mail Access Protocol (IMAP) |
| 161 | Simple Network Management Protocol (SNMP) |
| 443 | Hypertext Transfer Protocol Secure (HTTPS) |
