Find out who hosts any website.
Enter a domain to see the company behind its IP address, the CDN in front of it, its nameservers and mail provider, and the headers that gave them away. No account needed.
- IP owner from the registries
- CDN detection
- Nameservers and mail provider
- IPv4 and IPv6
- Server headers explained
What you get
One lookup. The host, the CDN and the clues.
The checker resolves the domain, asks the IP registries who owns each address, reads the domain's nameservers and mail servers, and checks the homepage's headers for a CDN.
hosting · example.com
done
- ip address104.21.0.1
- networkCLOUDFLARENET
- ownerCloudflare, Inc.
- cdnCloudflare, origin hidden
- nameserversCloudflare DNS
- mailGoogle Workspace
- server headercloudflare
Why it matters
Knowing the host saves you guesswork.
A website depends on several companies at once: the host that runs the server, often a CDN in front of it, a DNS provider and a mail service. Knowing which is which tells you who to call and what a change will touch.
Migrations
Know what you are moving
Before a move or a redesign, see which host, DNS provider and mail service a domain relies on, so nothing gets cut off along the way.
Speed
See what serves your pages
Whether a CDN sits in front of the server tells you how pages reach visitors far away, and where caching happens.
Research
Size up any site
The host and CDN behind a competitor's or a prospect's site say a lot about how it is built and run.
Who it's for
Built for the people who look after websites.
01
SEO specialists
Check the hosting and CDN setup during an audit, and confirm where a site lives before a migration.
02
Developers
Confirm that a DNS change took effect and that traffic now goes through the CDN or host you expect.
03
Agencies
When a new client arrives, find where their site, DNS and email live before anyone has found the logins.
04
Site owners
Forgot where your site is hosted? Find the company behind it, and the one running your email.
How it works
From domain to host in seconds.
01
Enter a domain
Type a domain or paste any URL. The checker uses its host name, such as www.example.com.
02
Look up the addresses
Public DNS gives the IPv4 and IPv6 addresses, the nameservers and the mail servers. The IP registries say who owns each address.
03
Read the headers
One request to the homepage reads headers such as server and via, which often name the CDN or host serving the site.
FAQ
Questions, answered.
It looks up the IP addresses a domain points to, then asks the public IP registries who owns each one. The owner is usually the hosting company, cloud provider or CDN serving the site. This checker also reads the domain's nameservers, mail servers and homepage headers for more clues.
Enter the domain above. If the IP address belongs to a hosting company or cloud provider, such as Hetzner, DigitalOcean or Amazon Web Services, that is the host. If it belongs to a CDN such as Cloudflare, the real host is hidden, and the headers, nameservers and mail provider are the clues left.
Cloudflare and similar services work as a proxy. Visitors connect to the CDN, and the CDN fetches the page from the origin server. The domain's DNS points at the CDN's addresses, so the origin's address never appears in public records. No honest public lookup can reveal it; only the site owner can tell you.
The host runs the server that stores and builds the site. A CDN is a network of servers in front of it that caches pages close to visitors. The DNS provider answers the question of where a domain points. They are often three different companies, such as a server at Hetzner behind Cloudflare, with DNS at Amazon Route 53.
From RDAP, the modern replacement for WHOIS. It is run by the five regional internet registries that hand out IP addresses: ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC. Each one records the network an address belongs to and the organisation it is registered to.
Not always. It is the country where the network is registered. Cloud providers and CDNs often register large blocks of addresses in one country and use them in data centers around the world.
They are often run by other companies than the host, such as Cloudflare DNS with Google Workspace for email. You need to know them before moving a site, and when a CDN hides the host they are the best remaining clues to how the site is set up.
Server location is at most a weak signal for search engines. Speed matters more, and a slow or distant server can make pages slow for visitors. A CDN helps by serving pages from nearby. For targeting a country, a country domain and hreflang matter far more than where the server sits.
Yes. Enter a subdomain such as blog.example.com to see the addresses and headers for that host. The nameservers and mail servers are read for the domain it belongs to.
Yes. You can run 10 checks a day without an account. It uses only public DNS, the public IP registries and one request to the site itself.
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