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Open port checker

Check if a TCP port is open, closed or filtered on any host or IP address, from 300+ locations worldwide, in one click.

Examples: 300+ locations worldwide · results in about 10 seconds

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  • All check locations in the report
  • TLS, headers & timing details
  • Scheduled reports
  • REST API access
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Why is a port tester tool important

Every port’s status is important for functionality and security of the wide variety of web-related services and port scan tool, our HostTracker team provides, will help in solving a lot of connectivity and software stability and usability issues. Our ports checker online will allow you to save time on checking the status of your ports.

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How our port scanner works

HostTracker’s online check port tool is working with TCP and UDP protocols to achieve a more precise result. When you want to check if a server port open - our tool sends a data packet to its destination - port on a specified server. After the online port scan is complete - you get the result with port status.

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Advantages of our port scanner tool

It is possible to check port server status from several locations to gather maximum information about connectivity. In addition port open check online is capable of running the check utility from a variety of network nodes around the globe. HostTracker’s port check service provides a fully user-friendly interface and report.

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More about port checking - open vs closed vs filtered, mail ports, and common questions.

Need this checked around the clock, not just once? Set up availability monitoring

Key takeaways

  • This tool opens a TCP connection to the host and port you enter and reports whether the connection was accepted, actively refused, or timed out with no reply at all.
  • Accepted means something is listening; refused means nothing is listening but the host answered; a timeout usually means a firewall is silently dropping the packets.
  • The check runs from more than 300 HostTracker locations, which is how a firewall rule that blocks one region becomes visible.
  • It is free, needs no login and no credit card.
  • For continuous checks, see the port monitoring page.

Frequently asked questions.

An open port accepts the connection, a closed port actively refuses it, and a filtered port drops the request with no reply at all, usually because a firewall sits in the way. Run the check above to see which of the three your port returns.
Forward the port on your router first, then run this tool against your public IP address or host name, not your local network address. A port that only answers on your LAN still shows as closed or filtered from the outside.
It depends on the service: 22 (SSH), 25 (SMTP), 80 (HTTP), 443 (HTTPS) and 3389 (RDP) are the ones most commonly tested, but you can check any port number from 1 to 65535.
A one-off test only tells you about this second. TCP port monitoring keeps checking the port around the clock and alerts you the moment it closes.

Part of HostTracker's website monitoring software.