Common Ports
  • FTP - 20 & 21
  • SSH, SCP, SFTP - 22
  • Telnet - 23
  • SMTP - 25
  • TACACS - 49
  • DNS - 53
  • DHCP - 67 & 68
  • TFTP - 69
  • HTTP - 80
  • Kerberos - 88
  • POP3 - 110
  • NetBIOS - 137-139
  • IMAP4 - 143
  • SNMP - 161
  • LDAP - 389
  • SSL & HTTPS - 443
  • SMB - 445
  • LDAP with SSL - 636
  • FTPs - 989 & 990
  • Microsoft SQL Server - 1433
  • Layer 2 Tunneling Protocol (L2TP) - 1701
  • Point-to-Point Tunneling Protocol (PPTP) - 1723
  • RDP protocol and Terminal Services - 3389
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