Network Ports

Network Ports
Number  Assignment
20      FTP Data Transfer
21      FTP Command Control
22      SSH
23      Telnet
25      SMTP
53      DNS
67,68   DHCP
80      HTTP
110     POP3
123     NTP
161     SNMP
194     IRC
443     HTTPS
546,547 DHCPv6

1194    OpenVPN (UDP)