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