Free open ports checker · Instant · No signup
Open Ports Checker
See which common ports are open on a host. Domain Doctor safely probes standard ports and flags risky exposed services like databases and remote desktop.
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What this checks
Every open port is a door. Web ports (80/443) should be open; a database port (3306), remote desktop (3389) or Telnet (23) exposed to the internet is a serious risk that invites brute-force and exploitation.
Domain Doctor performs a lightweight, safe connect-scan of common ports on your domain’s public IP and flags the ones that should not be open to the world — so you can lock them down behind a firewall or VPN.
Common Open Ports Checker errors
- MySQL/PostgreSQL database port open to the internet
- RDP (3389) exposed, inviting brute-force attacks
- Telnet (23) or FTP (21) offering unencrypted access
- Admin panels reachable without a firewall
VASTROX MANAGED HOSTING
Lock down exposed services
We firewall risky ports (databases, RDP) behind VPN and expose only what should be public.
- Firewall audit and lockdown
- Databases & admin behind VPN
- Only web ports exposed
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Frequently asked questions
Which open ports are dangerous?
Database ports (3306, 5432), remote desktop (3389), Telnet (23) and unencrypted FTP (21) should never be open to the public internet. Restrict them to a firewall or VPN.
Is this port scan safe and legal to run on my own domain?
Yes. It is a light connect-scan of common ports on the public IP your domain resolves to — the same thing any visitor’s browser does when it connects. Only scan domains you own or are authorised to test.