Portas utilizadas pelos serviços de Rede mais comuns

Quadro com as portas dos serviços mais comuns e que devem ser sabidas de cor por qualquer administrador de redes.
Porta(s) Serviços
20, 21 File Transfer Protocol (FTP)
23 Telnet
25 Simple Mail Transfer Protocol (SMTP)
50, 51 IPSec
53 Domain Name Server (DNS)
67, 68 Dynamic Host Configuration Protocol (DHCP)
69 Trivial File Transfer Protocol (TFTP)
80 HyperText Transfer Protocol (HTTP)
88, 749 Kerberos
110 Post Office Protocol (POP3)
119 Network News Transport Protocol (NNTP)
137-139 NetBIOS
143 Internet Message Access Protocol (IMAP4)
161, 162 Simple Network Management Protocol (SNMP)
389 Lightweight Directory Access Protocol (LDAP)
443 HTTP with Secure Sockets Layer (SSL)
1701 Layer Two Tunneling Protocol (L2TP)
1723 Point-to-point Tunneling Protocol (PPTP)