port numbers for common network applications http ftp tftp telnet ssh smtp dns

21 - FTP - File Transfer Protocol 22 - SSH - Secure Shell Server 23 - Telnet - Telnet 25 - SMTP - Simple Mail Transport Protocol 43 - WHOIS - WHOIS 52 - DNS - Domain Name System 67 - DHCP - Dynamic Host Configuration Protocol 79 - ETRN Finger - Extended Turn SMTP 80 - HTTP - Hypertext Transfer Protocol 102 - X.400 - X.400 (Exchange Mail) 110 - POP3 - Post Office Protocol 115 - SFTP - Secure File Transfer Protocol 119 - Newsgroup - Newsgroup 123 - NTP - Network Time Protocol 143 - IMAP4 - Internet Message Access Protocol 161 - SNMP - Simple Network Management Protocol 179 - BGP - Border Gateway Protocol 389 - LDAP - Lightweight Directory Access Protocol 443 - SSL - Secure Socket Layer 445 - AD/SMB - Active Directory & Server Message Block 636 - LDAP over SSL - Secure LDAP 993 - Secure IMAP - Secure IMAP 1433 - SQL - Microsoft SQL (Replication port) 1434 - SQL - Microsoft SQL (Monitoring port) 1701 - L2TP - Layer 2 Tunneling Protocol 1720 - H.323 - ITU Telecommunication 1723 - PPTP - Point-to-Point Tunneling Protocol 3389 - RDP - Remote Desktop Protocol 8080 - HTTP - Hypertext Transfer Protocol