How to Tell What Platform a Website Is Built On (Shopify, Wix, Squarespace and More)
To tell what platform a site runs on, read what its domain points to and how it answers. The website host checker does both: it reads each domain's CNAME and A records, plus the headers of one request to the home page, and matches them against the setups Vercel, Shopify, Wix, Squarespace, Netlify and others publish. Each row shows the evidence behind the call.
Step 1: enter the sites
Paste a domain, a URL or a list, one per line. Email addresses and URLs are reduced to their domain. Up to 100 a run without an account, 500 after a free Google sign-in.
Step 2: let it read the records and headers
For each domain it reads the CNAME (and the www CNAME), the A records, NS and MX records, and one GET request to the home page. Platforms tell customers which records to add: Vercel's docs give the A record 76.76.21.21 and a CNAME to cname.vercel-dns.com, GitHub Pages gives four addresses in 185.199.108.153 to 185.199.111.153, and Shopify, Squarespace, Wix, Netlify and Webflow publish theirs. Many also label responses: Vercel sends server: Vercel, Netlify server: Netlify, GitHub server: GitHub.com, and Shopify adds an x-shopid header.
Step 3: read the platform and the evidence
Each result names the platform and the exact record or header. That matters because the evidence tells you how sure to be: a documented platform CNAME is stronger than a single header.
Step 4: when it says Cloudflare or another CDN
A proxy or CDN in front hides the origin. When a domain's A records fall in Cloudflare's published ranges, or the response carries a cf-ray header, the visitor talks to Cloudflare. Amazon CloudFront, Fastly and Akamai are shown as the CDN. The host behind is named only if another record or header gives it away; Shopify behind Cloudflare often does.
Step 5: download and use the CSV
The CSV has the platform, the evidence, IP addresses, DNS host and email provider for every domain. Filter by platform to build a segment. For example, finding Shopify stores in a list of websites uses this directly.
Platform is not the same as email provider
A site on Shopify or Vercel with mail on Google Workspace or Microsoft 365 is normal. Mail follows the MX records, so each row also names the email provider, and the DNS host from the NS records. For the full mail picture, use the email stack lookup, or read how to find which company hosts a website.
What this check cannot do
- It reads the home page once; other pages may be served differently.
- A CDN or proxy can hide the origin host.
- A site that blocks automated traffic can answer with an error while loading in a browser.
- A platform match is evidence, not a statement from the site's owner.
- It does not say whether a site is live; the bulk website status checker does.
If you are emailing the owners
Correct DNS and a good domain get mail to the door; the address still has to exist. Upload your list on the verify page: the first 100 email checks are free with a Google sign-in, no card. Each address comes back valid, risky or invalid with a reason, and nothing is sent to anyone on the list. For larger or recurring lists, see bulk email verification, list cleaning and pricing.
Check your sites now
Paste them into the website host checker.
Common questions
How can I tell what platform a website is built on?
Check its DNS records and response headers. Platforms publish the CNAME or A record customers add, and many label responses, such as server: Vercel or x-shopid for Shopify. The website host checker matches both and shows which matched.
Why does it say a site is behind Cloudflare?
Cloudflare's proxy answers for the real server, so the origin host is hidden on purpose. The checker says so rather than guess, and names the platform if a header still shows through.
Can I check many sites at once?
Yes. Up to 100 sites a run without an account and 500 after a free Google sign-in, with a CSV download.
Does it read the page content?
No. It makes one request to the home page, reads the headers of the first response and stops. No page body is read and no redirect is followed.
Is this the same as who sells the domain?
No. The registrar, DNS host, web host and email provider can all be different companies.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.