About IPTools UK

IPTools UK is a free collection of IP address, DNS, domain and network diagnostic tools, built to be fast, accessible, and usable by both nontechnical visitors checking their own connection and developers debugging infrastructure. There's no account, no paywall, and no tracking-based business model.

How the data sources work

Every tool is honest about where its data comes from, and every tool works without any paid subscription:

• Your own IP, location and network details come directly from Cloudflare's trusted edge network — the same infrastructure that serves this site.
• DNS lookups use DNS-over-HTTPS against Cloudflare's public 1.1.1.1 resolver.
• WHOIS/RDAP data is queried directly from the correct registry using IANA's official RDAP bootstrap files — no third-party WHOIS proxy is involved.
• ASN lookups use Team Cymru's long-established, free IP-to-ASN DNS service.
• HTTP header and port checks query only the specific host you ask for, with strong protections against the tools being used to probe internal infrastructure (see our acceptable use policy).

Optional external providers

Two tools support an optional, separately configured external provider for richer data that Cloudflare and free registries can't supply:

• IP lookup can use a paid geolocation provider (currently supported: ipinfo.io) for city-level location detail beyond what RDAP provides. Without one configured, the tool still returns country, ASN, network organisation and reverse DNS at no cost.
• SSL checker requires an external certificate-inspection service, since the Cloudflare Workers platform this site runs on does not expose raw TLS certificate details for third-party hosts to application code. Without one configured, the page explains this plainly rather than fabricating a result.

If a given deployment of this site has either configured, the specific address or hostname you look up is sent to that provider to answer your query — see our privacy notice for details.

How this site is built

IPTools UK is built with Astro and TypeScript, deployed on Cloudflare Workers. Pages are rendered on the server so that content, results and navigation are fully readable without JavaScript; a small amount of JavaScript progressively enhances calculators for instant, in-browser results. There is no client-side UI framework, no page weighed down by an unused component library, and no invasive analytics.

Feedback

Spotted something wrong, or have a tool you'd like to see? Get in touch via the contact page.