Just giving the list of common ports.
21 FTP
22 SSH
23 Telnet
25 SMTP
53 DNS (Domain Name Service)
68 DHCP
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)
993 SIMAP (Secure Internet Message Access Protocol)
995 SPOP (Secure Post Office Protocol)
4000 ICQ
5010 Yahoo! Messenger
5190 AOL Instant Messenger
5632 PC Anywhere
5800 + 5900 VNC (Remote Admin Software)
8080 HTTP Proxy
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