Test the most common public ports

Administrators can run this during an inventory or troubleshooting session to confirm which expected services are actually reachable.

Probe the most common public ports on a domain and see which services answer, without checking every address and port manually one by one.

How to use

Enter the domain name or address you want to check in the provided field.
Start the test to request a probe of the most common public ports.
Wait while the tool queries the target and gathers the responses.
Read the list of services that answer and note those that stay silent.
Compare those observations with the services you expect on that machine.

Example

A website owner is preparing a server migration and wants to confirm that the usual services are reachable from outside. They enter the domain, run the test and review the ports that answer. If an expected service is missing, they check the firewall and service configuration before going live.

Limits and formats

The tool covers only common public ports, not every possible port.
A port may be filtered by a firewall and look closed even when the service exists.
Results depend on the target availability and configuration at the time of the test.
A service can answer on a port without the application being fully functional.
Use this diagnostic only on domains you are allowed to examine.

Where processing happens

The domain or address you enter is sent to the YOORfree server. That server queries the public DNS or the target site itself and returns the test result. No file is uploaded from your device. The check is limited to the common public ports requested. What you see depends on the responses received during the verification.

Frequently asked questions

What does it mean when an expected port does not answer?

It may mean the service is stopped, a firewall is filtering access, or the target is not responding correctly. Check the service configuration, review network rules, and run the test again later before drawing a firm conclusion.

Can I test several domains at once?

No, the field expects one domain or address at a time. To compare several domains, run a separate test for each one, note which ports answer, and keep those observations in your documentation.

Can this tool find a security flaw?

No, it only shows whether common public ports answer. It does not perform vulnerability analysis, does not test applications, and does not replace a security audit carried out by a qualified professional.