Disclosure

rangelab is free. Some outbound links — for example to object storage, CDNs, or media/video hosting providers — may be affiliate links: if you sign up through them we may earn a commission at no extra cost to you. A commission never changes what the tool reports.

Informational, not a conformance test. rangelab resolves the RFC 9110 Range and Content-Range rules statically from the values you paste; it does not make a live request and cannot account for server-specific behavior, proxies/CDNs, or non-standard implementations. We are not affiliated with the IETF or any hosting provider. Confirm against your real server.

Your privacy: this is a static, client-side tool — everything you paste stays in your browser and is never uploaded.