| Question | Answer |
| Port 1 | TCP Port Service Multiplexer (TCPMUX) |
| Port 5 | Remote Job Entry (RJE) |
| Port 7 | ECHO |
| Port 18 | Message Send Protocol (MSP) |
| Port 20 | FTP -- Data |
| Port 21 | FTP -- Control |
| Port 22 | SSH Remote Login Protocol |
| Port 23 | Telnet |
| Port 25 | Simple Mail Transfer Protocol (SMTP) |
| Port 29 | MSG ICP |
| Port 37 | Time |
| Port 42 | Host Name Server (Nameserv) |
| Port 43 | WhoIs |
| Port 49 | Login Host Protocol (Login) |
| Port 53 | Domain Name System (DNS) |
| Port 69 | Trivial File Transfer Protocol (TFTP) |
| Port 70 | Gopher Services |
| Port 79 | Finger |
| Port 80 | HTTP |
| Port 103 | X.400 Standard |
| Port 108 | SNA Gateway Access Server |
| Port 109 | POP2 |
| Port 110 | POP3 |
| Port 115 | Simple File Transfer Protocol (SFTP) |
| Port 118 | SQL Services |
| Port 119 | Newsgroup (NNTP) |
| Port 137 | NetBIOS Name Service |
| Port 139 | NetBIOS Datagram Service |
| Port 143 | Interim Mail Access Protocol (IMAP) |
| Port 150 | NetBIOS Session Service |
| Port 156 | SQL Server |
| Port 161 | SNMP |
| Port 179 | Border Gateway Protocol (BGP) |
| Port 190 | Gateway Access Control Protocol (GACP) |
| Port 194 | Internet Relay Chat (IRC) |
| Port 197 | Directory Location Service (DLS) |
| Port 389 | Lightweight Directory Access Protocol (LDAP) |
| Port 396 | Novell Netware over IP |
| Port 443 | HTTPS |
| Port 444 | Simple Network Paging Protocol (SNPP) |
| Port 445 | Microsoft-DS |
| Port 458 | Apple QuickTime |
| Port 546 | DHCP Client |
| Port 547 | DHCP Server |
| Port 563 | SNEWS |
| Port 569 | MSN |
| Port 1080 | Socks |
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