localhost.run creates an SSH tunnel that connects web applications on a local computer to the internet.
Freemium
24 alternativesPortChecker
Port Checker tests whether ports are open and whether router port forwarding is configured.
About PortChecker
PortChecker checks whether a specific port is open on a computer or device and whether router port forwarding is set up. Users can enter a custom port number from 1 to 65535. It defaults to the visitor's IP address and allows a different IP to be entered to check remote clients and servers. It also lists commonly used ports and describes port ranges, which can help diagnose connection problems with programs such as email clients, chat apps, or a hosted Minecraft server on port 25565.
Results may be inaccurate when using a VPN or proxy server, because the tool may not detect the device's IP correctly.
Key features
- Checks whether a specific port is open on a device
- Tests router port forwarding configuration
- Accepts custom port numbers from 1 to 65535
- Defaults to visitor's IP with option to enter other IPs
- Lists commonly used ports such as 80, 443, and 25565
- Explains port ranges and port forwarding concepts
Best for: People troubleshooting connection issues or verifying port forwarding for hosted services and game servers.
Good for
- Accepts any custom port number to check
- Can check the visitor's IP or a different entered IP
- Provides a reference list of common ports and port ranges
Watch out for
- May not detect the correct device IP when using a VPN or proxy
- Checking other IPs may be restricted if the option is misused
PortChecker at a glance
- Website
- portchecker.co
- Category
- Development › Network Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
PortChecker alternatives
Tools and sites you could use instead, ranked by how closely they match.
Check whether network ports are open and test port forwarding or router connectivity with PortCheckers.
Trace network latency by continuously pinging each host between a computer and its destination.
Open source
24 alternativesCanYouSeeMe checks whether an internet connection has an open port and verifies port forwarding.
Check for Cloudflare tests whether a domain uses Cloudflare DNS and checks global locations.
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PortChecker FAQ
What does PortChecker do?
It checks if ports are open on a computer or device and helps test port forwarding settings on a router to diagnose firewall setup problems.
Which port do I check for a Minecraft server?
Check port 25565 to confirm it is configured for port forwarding so others can connect to the server.
Why might the detected IP be wrong?
If you use a VPN or proxy server, the tool may not be able to get your device's IP correctly.
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