Free DNS, email, network and developer tools for the people who keep systems running.
HTTPfy is built and operated by CloudAid Inc. in Ontario, Canada. It is a free set of tools for checking DNS, email authentication, certificates, networks and HTTP, plus everyday developer utilities.
Every lookup runs live when you ask for it: DNS queries go to public resolvers or straight to a domain's authoritative name servers, certificate checks open a real TLS connection, and HTTP checks make the real request. Nothing is guessed or made up. When a result comes from a short-lived cache, the page says so and shows when it was checked.
Reference pages (record types, status codes, ports, network data and so on) combine data from public registries with our own measurements. Each page lists its sources. Explanatory text is drafted with AI assistance and checked against the cited standards and registries before it is published. Computed values such as subnet ranges or cron run times are generated by code from the inputs shown on the page. We do not publish machine-written filler text. See Data sources and methodology.
The tools only contact public internet addresses. Requests to private networks, loopback or cloud metadata addresses are refused, and abusive use is rate limited.
Questions, bug reports or tool requests: [email protected].