How to Find Which Company Hosts a Website

To find which company hosts a website, read its DNS records and the headers its server sends. The website host checker does both for one domain or a list: it reads CNAME, A, NS and MX records and makes one request to the home page, then names the platform with the exact record or header that matched. It also shows who runs the domain's DNS and email.

Find who hosts a website →

Find the host with the checker

1. Open the website host checker.
2. Enter a domain or website address, or paste a list, one per line. Email addresses and full URLs are reduced to their domain.
3. Press Find the host. For each domain it reads the CNAME (and the www CNAME), A, NS and MX records, and the headers of one GET request to the home page. No page body is read and no redirect is followed.
4. Read the platform for each site with the evidence behind it. A site behind Cloudflare or another CDN is shown as such when its origin is hidden.
5. Download the CSV with evidence, IP addresses, DNS host and email provider.

Find the host by hand

Check the headers:

curl -sI https://vercel.com | grep -i "^server"
# server: Vercel
curl -sI https://www.netlify.com | grep -i "^server"
# server: Netlify

Then check where the domain points:

dig +short CNAME www.example-store.com   # a Shopify store showed shops.myshopify.com on 8 Nov 2026
dig +short A example.com

An IP address alone rarely names a company. Look it up in a registry such as ARIN's whois (whois 192.0.2.1) to see which network owns it, which is often a cloud provider rather than the platform you'd recognise.

When the host is hidden

When the A records fall in Cloudflare's published IP ranges or the response carries a cf-ray header, the visitor is talking to Cloudflare, and the origin behind it is deliberately hidden. A Shopify store we checked on 8 November 2026 answered with server: cloudflare and cf-ray, but also powered-by: Shopify, so the platform still showed. When no platform header comes through, nobody outside can see the origin from public data.

Website host vs email provider

Mail is decided by the domain's MX records, not by the website. A site on Shopify or Vercel with mail on Google Workspace or Microsoft 365 is normal. To see every mail service a company uses, run the email stack lookup. To find every Shopify store in a list of sites, see find Shopify stores in a list of websites.

Next step: check the contacts before you email them

Building a prospect list from the sites you checked? Upload the contact addresses at /verify to check each mailbox without sending. The first 100 checks are free with a Google sign-in, no card.

Pro, $39 a month: Unlimited email verification.* Never metered, never cut off. See pricing.

*Fair use: the first 100,000 checks a month at full speed, then slower, never cut off.