About
Find out who hosts any website
The maker
Built by Piotr Kulpinski
Founder of HostingChecker.online and a web developer with over a decade of experience in DNS, hosting infrastructure, and domain management. Piotr builds tools that help developers and site owners understand their web stack.
He runs the site on his own, from Poland, and also makes OpenAlternative, DevSuite, Revinel and Dirstarter. Questions, bug reports and feature ideas go straight to him at hello@hostingchecker.online.
How it works
Where the data comes from
Every lookup runs live against public sources. Results are cached for up to an hour.
- DNS records
- Queried live from the Cloudflare (1.1.1.1) and Google (8.8.8.8) resolvers, following every CNAME to the end of the chain.
- SSL certificate
- Read from a TLS handshake with the server, the same way a browser gets it.
- IP address and network
- Location and network owner from IPinfo, network type from PeeringDB, and the announced route from RIPEstat.
- Domain registration
- RDAP from the registry and the registrar, with WHOIS as the fallback for domain endings that have no RDAP server.
- Server response
- One HEAD request to the server, whose response headers often name the CDN or platform.
The hosting provider comes from matching all of this against a list of known networks, CDNs, platforms, DNS hosts and email providers. Each result lists the evidence behind it, such as the network that owns the IP address or a CNAME that points to a platform.
A CDN or proxy such as Cloudflare can hide the server behind it. In that case the result names the CDN and says the origin is hidden, instead of guessing.
Free lookup tool
Find out who hosts any website
Enter a domain or IP to uncover hosting details, DNS records, and server location.