Open Port Checker
Check if a specific TCP port is open on a target host.
About
The open port checker is a tool you can use to check your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall. This tool may also be used as a port scanner to scan your network for ports that are commonly forwarded. It is important to note that some ports, such as port 25, are often blocked at the ISP level in an attempt to prevent malicious activity.
Key Features
- TCP Port Check
- Support for IP and Domains
- Fast feedback
- Simple Interface
How to use
- 1Enter or select the supported input.
- 2Choose the available settings and run the tool.
- 3Review the result, then copy or download it.
Example
Input
example.com · TCP 443Output
Connection succeeds or times outLimitations
- Only a single public TCP host and port are checked. Firewalls, filtering, and timeouts can affect the result.
- This tool requires a server request. The privacy page explains exactly what is sent and retained.
Last reviewed: