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PortGuard

Know what's exposed on your network — free, instant, no signup.

Covers the most commonly exposed ports and what to do about each.

Commonly checked ports

  • 21 — FTP
  • 22 — SSH
  • 23 — Telnet
  • 25 — SMTP
  • 53 — DNS
  • 80 — HTTP
  • 110 — POP3
  • 143 — IMAP
  • 443 — HTTPS
  • 445 — SMB
  • 1433 — Microsoft SQL Server
  • 3306 — MySQL
  • 3389 — RDP
  • 5432 — PostgreSQL
  • 5900 — VNC
  • 6379 — Redis
  • 8080 — HTTP (alternate)
  • 8443 — HTTPS (alternate)
  • 27017 — MongoDB