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About
The Open Port Checker App is a network diagnostic tool designed to assess the status of specific TCP or UDP ports on remote servers or local devices. Acting as a free online platform, it enables users to test whether a port is open, closed, or filtered, which is essential for verifying port forwarding, identifying firewall or ISP blocking, and ensuring server or application accessibility. The tool works by attempting to connect to a particular port on a target IP address, thus offering insights into network diagnostics, server configuration checks, and security audits. Users can benefit from improved remote access, enhanced network security, and optimized application setups by using this app. The Open Port Checker App supports a variety of ports and services and provides safe usage without storing sensitive user data. It's a valuable resource for troubleshooting port-related issues, conducting security evaluations, and ensuring applications are set up correctly for network access.
Problem & solution
Problem
Need to know if a device/server port is reachable from the internet
Solution
Online tool tests TCP/UDP ports as open, closed, or filtered
Who it's for
Network admins and users troubleshooting server access
Main features
- Port status check
- TCP/UDP connection tests
- IP/hostname input
- Use current IP autofill
- Common ports list
Use cases
- Verify router port forwarding
- Detect firewall/ISP port blocking
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