most important ports #tcp/udp

Today I want to describe the most important ports that a developer probably should know about. So check this out:

  • 20: ftp-data (file transfer; default data)
  • 21: ftp (file transfer; control)
  • 22: secure shell
  • 23: telnet
  • 25: simple mail transfer
  • 53: domain name system (DNS)
  • 67: boostrap protocol server (dhcp server)
  • 68: boostrap protocol client
  • 69: tpft (trivial file transfer protocol)
  • 80: http
  • 110: post office protocol – version 3 (pop 3)
  • 119: network news transfer protocol
  • 123: network time protocol
  • 137/138/139: NetBIOS
  • 143: internet message access protocol (imap)
  • 161/162: simple network managment
  • 443: https
  • 445: Microsoft DS
  • 465: smpts (smtp secure)
  • 500: ip-security vpn
  • 587: simple mail transfer submission (smtp)
  • 993: impas (imap4 over tls/ssl)
  • 995: pop3 over tls/ssl
  • 989/990: ftp over tls/ssl
  • 3389: remote desktop