This is a list of common ports and their use:
- http - 80
- https, ssl - 443
- dhcp - 67
- dns - 53
- imap - 143
- smtp - 25
- pop - 110
- s-imap - 998
- s-pop - 995
- citrix - 1494
- citrix terminal server - 1604
- ftp - 20
- vpn - 1194
- voip - 1071
- telnet - 23
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