Open Port Checker
Open Port Checker is a free online utility designed to test the reachability of TCP and UDP ports from an external network. It allows users to enter an IP address or hostname along with a target port to determine if a service is accessible from outside the local network. The tool displays TCP and UDP results side by side, enabling users to distinguish between open, closed, filtered, or inconclusive port states.
This service is useful for verifying open ports, troubleshooting port forwarding, and diagnosing issues related to firewalls, routers, ISPs, or CGNAT configurations. It provides instant feedback and practical context for interpreting port status, including guidance on next steps when encountering closed, filtered, or open-or-filtered results, particularly during network changes or outages. The platform highlights that inconclusive UDP results should not be treated as closed, offering clarity for more effective troubleshooting.
Open Port Checker operates entirely through a web interface, requiring no installation or downloads. Users can select from a list of common ports such as HTTPS (443), HTTP (80), SSH (22), DNS (53), and others, or specify custom ports as needed. The tool emphasizes the importance of having permission before scanning or testing endpoints not owned by the user.
As a class, Open Port Checker is an external port testing tool focused on network diagnostics and verification. It is available free of charge.
Overview
9 featuresOpen Port Checker is a Network & server monitoring project. It focuses on testing whether a specific port on a device is open and reachable from the public internet, helping users troubleshoot network and firewall issues. It is built as a consumer product for network administrators. Open Port Checker is free to use. Open Port Checker is available on the web, the command line, and API.
Among its 9 catalogued features are TCP port check, UDP port check, and external network probe. The interface is available in 10 languages, including German, English, and Spanish. It exposes integrations via a public API.
Summary written by a language model from the project’s public pages.
- TCP port check
- UDP port check
- External network probe
- Firewall troubleshooting
- Port forwarding verification
- API access
- CLI tool
- Live results
- Common ports presets
Built with & integrations
- Next.js
- x-nextjs-cache header · x-nextjs-prerender header · x-powered-by header
- Cloudflare
- cf-ray header · cf-cache-status header
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about Open Port Checker
- What is Open Port Checker?
- Open Port Checker focuses on testing whether a specific port on a device is open and reachable from the public internet, helping users troubleshoot network and firewall issues. It is catalogued under Network & server monitoring on PulseGate.
- Who is Open Port Checker for?
- Open Port Checker is a consumer product built for network administrators.
- Does Open Port Checker have a free plan?
- Yes — Open Port Checker is free to use.
- What platforms does Open Port Checker run on?
- Open Port Checker runs on the web, the command line, and API.
- Is Open Port Checker still maintained?
- Unverified. Open Port Checker has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
- What are alternatives to Open Port Checker?
- Similar projects tracked by PulseGate include Port Checker, Port Checker, and Portchecker.Port CheckerPort CheckerPortchecker
- What languages does Open Port Checker support?
- The interface is available in 10 languages, including German, English, and Spanish.
- Does Open Port Checker have an API or integrations?
- Yes — Open Port Checker exposes a public API.
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