Some of important Protocol Port Number
8080 HTTP Proxy
8200 VMware Server
49 TACACS
53 DNS
67-68 DHCP/BOOTP
69 TFTP
80 HTTP
123 NTP
102 MS Exchange
110 POP3
993 IMAP4 over SSL
995 POP3 over SSL
1080 SOCKS Proxy
1194 OpenVPN
143 IMAP4
161-162 SNMP
1701 L2TP
1812-1813 RADIUS
520 RIP
5060 SIP
8000 Internet Radio
6891-6901 Windows Live
513 rlogin
514 syslog
6881-6999 BitTorrent
5050 Yahoo! Messenger
646 LDP (MPLS)
554 RTSP