Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
Port Checker App is a free online port-checking tool for testing whether ports on a specified IP address or hostname are open, closed, or filtered. Its main use cases include verifying port forwarding, troubleshooting firewall or ISP blocking, and confirming whether servers and applications are reachable from the public internet. The creator is Palash Nag, an individual developer based in Lucknow, India. The page states that the project was created in March 2025 and made public on August 31, 2025.
The tool provides a browser-based form workflow: choose or enter a port, enter an IP/Hostname, or use your current public IP, then run the check. The page lists many common preset ports, including SSH, HTTP, HTTPS, DNS, MySQL, PostgreSQL, Redis, RDP, VNC, Memcached, Minecraft, and more, making it useful for operations and developers who need to quickly verify service reachability. The content also describes capabilities such as TCP/UDP scanning, single-port and multi-port checks, real-time response reports, and basic service identification based on port numbers. In the technical implementation section, it notes that the backend uses Node.js to initiate connection tests, while local IP scenarios switch to the WebSocket protocol.
In terms of pricing, the page clearly describes it as a free online tool and emphasizes free, unrestricted access to basic port-checking functionality. It does not disclose any paid plans, enterprise editions, or payment methods. The documentation quality is relatively good for this type of small utility: the page explains open port detection, port forwarding, firewall rules, port opening/closing, how to interpret the filtered state, and alternative testing methods such as nmap, telnet, netcat, and PowerShell, making it suitable for beginner-level troubleshooting. However, it does not provide an API, SDK, CLI, status page, SLA, or developer integration documentation.
Its advantages are that it requires no installation, is easy to use, provides straightforward results, and covers common network service ports. It is practical for troubleshooting home router port forwarding, game servers, remote desktop access, and public exposure of web/database services. The downsides are that it does not clarify whether it is open source, self-hostable, what support options are available, or how stable it will be over the long term. As a new tool launched in 2025, it should be used cautiously for production-level dependencies. It is best suited for network administrators, DevOps teams, developers, small businesses, and home users who need quick external reachability checks.
The page does not provide information about access from mainland China, ICP filing, nodes, or localized payment options, so china_access is unknown. If access is unstable, alternatives include nmap, telnet, netcat, PowerShell Test-NetConnection, or an online port-checking tool that is reliably accessible from within China.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on portchecker.app official site.
portchecker.app is an Unknown Dev Tools provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach portchecker.app directly.