Who hosts github.uk.
The company whose servers answer for a site, the CDN in front of them, and who runs its DNS and email, each with the evidence.
Looking up…
How the host is found.
- The address: the site's A record, following any alias. An alias that points at a platform's own name, such as
cname.vercel-dns.com, already names the platform. - The network: the AS that announces that address on the internet, from Team Cymru's routing data.
- The headers: many platforms stamp every response with a header of their own:
cf-rayfor Cloudflare,x-vercel-idfor Vercel,x-nf-request-idfor Netlify. Each match is listed under “How we know” with the header that proves it.
When the host stays hidden.
A CDN or a proxy such as Cloudflare answers in place of the server, so the address and the network belong to the CDN. If the platform behind it sends no header of its own, the real host cannot be seen from outside, and the tool says so rather than guess. Hiding the server is what the proxy is for.
Four companies, not one.
The web host, the DNS host (from the name servers), the email provider (from the mail servers) and the registrar are often four different companies. Moving a site to a new host changes only its address records: the domain, its email and its DNS can stay where they are.
Questions people ask.
How do I find out who hosts a website?
Type the domain. The checker looks up the site's address, finds the network that owns it, and reads the server's answer for signs of the platform and the CDN.
Why does it say Cloudflare?
Cloudflare's proxy sits in front of many sites and hides the server behind it, so the address belongs to Cloudflare. The real host cannot be seen from outside.
Is the web host the same as the registrar?
Not necessarily. The registrar is where the domain is registered, the web host serves the site, and the DNS host answers for the domain. They can be three different companies.
Can I find out who owns a website?
The owner's personal details are usually hidden. The registrar, the web host and the DNS provider can forward abuse reports or legal requests to the owner.
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Sources
- Team Cymru: IP to ASN mapping service
- Cloudflare: Ray ID and the cf-ray header
- Vercel: response headers (x-vercel-id)
- RFC 9110: HTTP semantics (header fields)
- RFC 1034: Domain names: concepts (aliases)
By Hivex. Updated 10 October 2026. Lookups run live through Cloudflare's public resolver and are kept for at most five minutes.