Lookup · live DNS + ASN

What's hosting this site?

Resolve any hostname to its IPs and find the ASN, geo, reverse DNS, and cloud provider behind each one — Cloudflare, AWS, Google Cloud, Vercel, Fastly, Azure, you name it.

Resolves A + AAAA via Cloudflare DoH

What this tool reveals

Every website lives on at least one server, and that server has at least one IP address, and that IP belongs to an Autonomous System (ASN) operated by some organization. This tool walks the chain from a hostname you know — like example.com — to all the IPs serving it, then back to who's running those IPs.

For each IP found in the A or AAAA records, we surface:

  • Address family — v4 or v6. Modern sites are dual-stack; v4-only sites are common but increasingly notable as v6 deployment grows.
  • Approximate geo — what city / country the geo-IP databases place this address in. For CDN edges this is the nearest PoP, not the origin.
  • ASN and organization — the network operator. AS13335 Cloudflare means the site is fronted by Cloudflare; AS16509 Amazon.com means an AWS-hosted server.
  • Reverse DNS (PTR) — what the IP claims its name is. Useful clue when ASN alone is ambiguous (e.g. vercel-edge-fra1.vercel.appidentifies Vercel even when the ASN is Cloudflare's).
  • Cloud-provider detection — when the ASN matches a known cloud brand, we tag it. Helpful for quickly knowing "this site is on AWS" without having to interpret the raw ASN.

Why CDN-fronted sites look the way they do

More than half the popular web sits behind Cloudflare, Fastly, AWS CloudFront, Akamai, or similar. When you look up a CDN-fronted site, the IPs you see are the CDN's anycast edges — not the origin server. That's normal and is what actually serves your visitors' requests. Asking "where is the origin behind the CDN" is sometimes possible (DNS history, mail server IPs, cert transparency) but it's a different exercise and often defeats the protective purpose of the CDN.

What this is not

  • Not a content-management-system detector. Knowing the IP is Vercel doesn't tell you whether the site is Next.js, Astro, or a static file. CMS detection requires fetching the HTML and looking for fingerprints.
  • Not a real-time monitor. Each lookup is a snapshot. Sites switch providers; results from a year ago may not reflect today.
  • Not authoritative for the legal owner. The ASN tells you which network operates the IP. Legal ownership of the site lives at the domain registration level — use the Domain age checker for that.

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