TCP Port Checker
Try one TCP connection to one public hostname or IP and one port. This is not a port scanner, ping test, banner grabber, or vulnerability scanner.
Result
Scope and privacy
Reachability is observed from Cloudflare Worker egress and may differ from your own network. The displayed milliseconds measure connection setup time; they are not ping latency. Cloudflare may block some destinations, including Cloudflare IP ranges and connection loops. Port 25, localhost, private, link-local, reserved, and special-use targets are blocked.
The checker writes no protocol payload, reads no banner, performs no TLS scan, makes one connection attempt, and does not save target history. Responses use no-store caching.
Common port labels are hints only and never identify the service actually running. Related tools: HTTP Headers Checker · DNS Lookup
About TCP Port Checker
Test whether one TCP port on one public host accepts a connection from the service.
How to use it
Enter the requested value, review it for accuracy, then run the tool. Read the labeled result fields before copying or using them in another workflow.
Understanding the result
The result presents the values returned or calculated for this specific request. Labels and status messages distinguish successful data, empty results, validation problems, and network errors.
Limitations and privacy
Only one TCP connection is tested; no banner, TLS, UDP, range, or vulnerability scan is performed. This check sends only the target needed for the requested lookup to the Learnova Network Tools service; no lookup history is intentionally stored by this tool.