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.

19 checks per scan Results in seconds Free, no signup

The tool

What the Open Ports Checker 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.

How it works

Check your domain in three steps

1Enter your domainType any domain into the box above and start the free scan. No signup, no software.

2We inspect it liveDomain Doctor safely probes common ports on your public IP, in real time from our servers.

3Get a clear verdictYou get a plain-language result, the exact records we found, and a concrete fix if anything is wrong.

What to watch for

Common Open Ports Checker problems

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 like databases and RDP behind a VPN and expose only what should be public.

Firewall audit and lockdown
Databases and admin behind a VPN
Only web ports exposed

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Questions

Frequently asked

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.