Port numbers

Common port numbers :

7 Echo
20 FTP Data
21 FTP Control
22 SSH
23 Telnet
25 SMTP
53 DNS
67 DHCP
69 TFTP
80 HTTP
88 Kerberos
102 MS Exchange
110 POP3
123 NTP
143 IMAP4
161 SNMP
389 LDAP
443 HTTPS

Protocol numbers :

1 ICMP
2 IGMP
4 IP-within-IP
6 TCP
8 EGP
9 IGP
17 UDP