Common ports used in Linux

20 FTP data (File Transfer Protocol) 
21 FTP (File Transfer Protocol) 
22 SSH (Secure Shell) 
23 Telnet 
25 SMTP (Send Mail Transfer Protocol) 
43 whois 
53 DNS (Domain Name Service) 
68 DHCP (Dynamic Host Control Protocol) 
79 Finger 
80 HTTP (HyperText Transfer Protocol) 
110 POP3 (Post Office Protocol, version 3) 
115 SFTP (Secure File Transfer Protocol) 
119 NNTP (Network New Transfer Protocol) 
123 NTP (Network Time Protocol) 
137 NetBIOS-ns 
138 NetBIOS-dgm 
139 NetBIOS 
143 IMAP (Internet Message Access Protocol) 
161 SNMP (Simple Network Management Protocol) 
194 IRC (Internet Relay Chat) 
220 IMAP3 (Internet Message Access Protocol 3) 
389 LDAP (Lightweight Directory Access Protocol) 
443 SSL (Secure Socket Layer) 
445 SMB (NetBIOS over TCP) 
666 Doom 
993 SIMAP (Secure Internet Message Access Protocol) 
995 SPOP (Secure Post Office Protocol) 

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