about netchecks.tools

About NetChecks

NetChecks is a working set of browser-based network diagnostics for the kind of question that comes up twenty times a day on a sysadmin or developer’s machine: what is my IP right now, does that domain resolve from the path my browser takes, does this host even speak HTTPS on port 8443, what does the WHOIS record for that domain look like, what does this MAC’s OUI map to. The site exists because the alternatives are heavy: an OS package install, a cloud-shell session, or a free service that hides the answer behind a banner ad and a newsletter pop-up.

The tool list

The cluster currently covers public IP lookup (IPv4 and IPv6), DNS lookup over DoH, WHOIS and RDAP, SSL certificate inspection via certificate transparency logs, HTTPS reachability checks, geolocation lookup, subnet calculations, MAC address vendor lookup, and a small ping/round-trip timer. Each tool is a single route with the answer above the fold and a short reference panel beneath it.

How the data is sourced

Where a lookup needs a real network call, NetChecks uses public, well-documented endpoints from the browser: ipify for echo, ipapi.co for geolocation, Cloudflare’s public DNS-over-HTTPS resolver for DNS, the RDAP gateway at rdap.org for WHOIS/RDAP queries, and Cert Spotter for certificate transparency lookups. Where math is sufficient — subnet boundaries, MAC OUI matching, address-class detection — the work runs locally without leaving the browser.

Who maintains NetChecks

NetChecks is published by the inovisum team, a small tools studio. The lookup endpoints and the OUI vendor list are reviewed each quarter; when a public resolver retires a path or an RDAP server changes its response schema, the affected tool is patched in the next release pass. The site is a static export — no application server, no database we control — so the diagnostic value comes from the browser fetches and the upstream APIs they hit.