Find out who hosts and powers any website.
Paste a domain and we will reveal the hosting provider, CDN, certificate, DNS, email host and CMS in under a second. Free anonymous tier, free account for higher limits.
Sample output
A complete fingerprint, on one page.
Each row below comes from a separate probe running in parallel, then merged into one fingerprint.
- ●Hosting + ASN derived from reverse-IP and BGP data.
- ●CDN, CMS and email host matched against a curated signature library.
- ●WHOIS / RDAP, TLS chain and HTTP timing in a single call.
Recently checked
The last public lookups.
| Domain | Hosting | Stack | DR | CC |
|---|---|---|---|---|
| 1414.tech-poly.cn | Cloudflare, Inc. |
Cloudflare
|
0 | 🇨🇦 CA |
| alphamoms.academy | Amazon.com, Inc. |
—
|
0 | 🇨🇦 CA |
| ffpanels.shop | 20i Limited |
—
|
0 | 🇬🇧 GB |
| atmospheric.agency | Fastly, Inc. |
Fastly
|
16 | 🇺🇸 US |
| gov.puri.sm | DigitalOcean, LLC |
WordPress
|
71 | 🇺🇸 US |
| 76-18.com | IONOS SE |
WordPress
|
0 | 🇪🇸 ES |
| 2097.tech-poly.cn | Cloudflare, Inc. |
Cloudflare
|
0 | 🇨🇦 CA |
| ai-empire.academy | Amazon.com, Inc. |
—
|
0 | 🇺🇸 US |
Public probes only · 24h dedup · 30+ day minimum domain age · noindex respected · records roll off after 60 days
From the blog
Reading on hosting, DNS and the stack.
-
HTTP Headers Explained: How to Read Them Like a Developer
Every time you open a website, your browser and the server swap hidden notes called HTTP headers. They reveal which server software is running, how things get cached, and whether security protections are switched on. This beginner-friendly guide shows you what those headers mean and how to read them yourself. By the end you'll inspect any site like a developer, no coding required.
· 8 min -
Security Headers Explained: HSTS, CSP, X-Frame-Options and More
Security headers are the cheapest hardening you can ship — a few lines in your server config and your site shrugs off a whole class of attacks. This guide walks through HSTS, CSP, X-Frame-Options and the rest from hands-on practice, including what's deprecated and what actually moves the needle. You'll get copy-paste config for nginx, Apache and common platforms, plus how a header checker grades your responses.
· 9 min -
AI Crawlers and Hosting: Can ChatGPT, Claude and Perplexity Reach You?
AI search visibility is the new SEO, but most people never check the boring prerequisite: can the bot actually fetch the page? I'll show you the crawlers that matter, why robots.txt and Cloudflare are two separate gates that don't talk to each other, and how a single edge toggle can lock out the very bots you're trying to court. Then I hand you the exact grep and curl I use to stop guessing.
· 9 min
How it works
No tricks. Just careful, parallel inspection.
Resolve
DNS lookup against authoritative resolvers — A, AAAA, NS, MX. Cached for one hour.
Probe
TLS handshake, HTTP fetch, RDAP query and IP enrichment run in parallel under a one-second budget.
Fingerprint
Match response headers, body markers and meta tags against a curated CDN, CMS and email-provider library.
FAQ
Common questions
How do you detect which hosting provider a website uses?
We resolve the domain to its IP address, then map that IP to the owning network using ASN and reverse-IP data. That reveals the datacenter or cloud provider behind the site — even when it sits behind a CDN. Results are heuristic but cross-checked against a curated signature library.
Is HostingChecker free?
Yes. Anonymous visitors get 3 lookups per day; a free account raises that to 50 per day. No credit card required.
What does a check reveal?
Hosting provider and ASN, IP (v4/v6), nameservers and DNS records, CDN/WAF, SSL/TLS certificate, HTTP server headers, CMS/framework, email provider, plus security-header, email-authentication (SPF/DKIM/DMARC) and IP-reputation signals.
Do you store the domains I check or my IP address?
Public checks may appear in the recent-checks feed (with privacy filtering) and are purged after a retention window. Your IP is used only for rate limiting. Result pages are noindex and excluded from search engines.
Why does a site show Cloudflare instead of the real host?
When a site is fronted by a CDN like Cloudflare, the visitor-facing IP belongs to the CDN, not the origin host. We label this clearly — the reverse-IP and ASN still point at the CDN, and origin detection is not always possible by design.