| Description | TCP Port Number |
| POP3 | 110 |
| SMTP | 25 |
| IMAP | 143 |
| HTTP | 80 |
| HTTPS | 443 |
| TELNET | 107 |
| FTP (Data Transfer) | 20 |
| FTP (Control) | 21 |
| Secure SMTP (SSMTP) | 465 |
| Secure IMAP (IMAP4 SSL) | 585 |
| IMAP4 over SSL | 993 |
| Secure POP3(SSL-POP) | 995 |
| Remote Desktop | 3389 |
| DNS (Client/Server) | 53 |
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