PORT NUMBERS

20,21 FTP (File transfer)
22 SSH (Remote login secure)
25 SMTP (Internet mail)
53 DNS (Host naming)
80 HTTP (Web)
88 Kerberos (computer authentication protocol)
110 POP3 (Client access)
119 NNTP (Usenet newsgroups)
123 NTP (Network time)
137-139 NetBIOS (DOS/Windows naming)
143 IMAP (Client access)
161,162 SNMP (Network management)
163,164 CMIP (Network management)
443 HTTPS (Web secure)
514 Syslog (Event logging)
563 NNTPS (Usenet newsgroups secure)
993/tcp IMAP4 over SSL, Internet Message Access Protocol
995/tcp POP3 over SSL, Post Office Protocol
989,990 FTPS (File transfer secure)
1723 Virtual private network (VPN)