Most Popular TCP Ports

(Fyodor [Summer 2008] scanned 10sMM of Internet hosts)

1. 80 (HTTP) - > 14% of open ports
2. 23 (Telnet) - particularly as an administration port on networking devices
3. 443 (HTTPS) - SSL-encrypted HTTP
4. 21 (FTP) - File Transfer Protocol
5. 22 (SSH) - Secure Shell
6. 25 (SMTP) - Simple Mail Transfer Protocol
7. 3389 (ms-term-server) - Microsoft Terminal Services
8. 110 (POP3) - Post Office Protocol v3
9. 445 (Microsoft-DS) - SMB over IP
10. 139 (NetBIOS-SSN) - NetBIOS Session Service
11. 143 (IMAP) - Internet Message Access Protocol version 2
12. 53 (DNS) - Domain Name System
13. 135 (MSRPC) - MS Remote Procedure Call services
14. 3306 (MySQL) - Database
15. 8080 (HTTP-proxy / Alt-HTTP)
16. 1723 (PPTP) - Point-to-point tunneling protocol
17. 111 (RPCBind) - Maps SunRPC program numbers to their current TCP or UDP port numbers
18. 995 (POP3S) - SSL-encrypted POP3
19. 993 (IMAPS) - SSL-encrypted IMAPv2
20. 5900 (VNC) - Virtual Network Computing