Focused tool
TCP Connectivity
Test one TCP port on a public host.
Run TCP Connectivity
View full JSON response
Examples
Use a validated example to fill the form and execute the exact input.
example.com
Usage and limits
Public network lookups use the canonical v1 JSON API with the existing input validation, timeout, response-size, rate, and SSRF controls. Tools using an API route transmit your input to this service. Browser-only tools are explicitly labelled.
API documentation: API reference. Canonical route: /api/v1/port-connectivity/.
Need a broader diagnosis?
Run Domain Diagnostics for a correlated result.
Run Domain Diagnostics