About & privacy
A deliberately small diagnostics page.
Linecheck measures a same-origin request and reads a few standard browser properties. It has no account system, advertising SDK, third-party JavaScript, or browser fingerprinting code.
Like every web server, the host may temporarily record technical access data needed for reliability and abuse prevention. Do not use this page as a substitute for a packet capture, an ISP-side measurement, or professional incident analysis.
Interpreting the result
A successful short request does not guarantee that a large or long-lived transfer will work. Route asymmetry, packet loss, congestion, middleboxes, DNS, and application policy can all produce different outcomes.