Domain Hosting Checker
Find out who hosts a website — resolves the domain's IP, identifies the network/organization behind it, and shows nameservers and reverse DNS for confirmation.
Input
Any http:// prefix, path or port is stripped automatically before the lookup.
Output
| Property | Value |
|---|---|
| No data yet | |
Guides
Enter a domain and find out who hosts it — this tool resolves the domain's IP address, then identifies the network/organization that IP belongs to (its official RDAP registration), and cross-checks that against nameservers and reverse DNS for extra confirmation.
How to use it
- Enter a domain or URL (any
http:///https://prefix, path, or port is stripped automatically). - Click Check hosting.
- Read the hosting details. Copy or download the table as a CSV file.
What each field means
- Resolved IP — the domain's IPv4 (or IPv6, if no IPv4 record exists) address.
- Hosting provider — the organization registered as operating that IP, from the IP's RDAP record (the modern, structured WHOIS). This is reliably the actual cloud/hosting company for most sites — e.g. Cloudflare, Amazon (AWS), Google Cloud, DigitalOcean, OVH.
- Network / ASN name — the raw network handle behind that organization (e.g.
CLOUDFLARENET), shown when it adds information beyond the hosting provider name. - Reverse DNS — the IP's PTR record, if one exists. Often spells the actual host out directly (e.g.
ec2-x-x-x-x.compute-1.amazonaws.comfor an AWS EC2 instance). - Nameservers — the domain's NS records. Useful when a CDN or DNS provider (Cloudflare, Route 53, …) sits in front of the real origin host — the nameservers can point at a different company than the IP's hosting provider does.
Why nameservers and reverse DNS too?
A single IP-to-organization lookup can be misleading on its own: a site behind a CDN or reverse proxy resolves to the CDN's IP, not the origin server's — so the "hosting provider" from the IP alone might just be the CDN. Nameservers and reverse DNS are independent signals that often reveal the layer underneath, so you get a fuller picture instead of a single, possibly incomplete answer.
Frequently asked questions
Why does this run on the server instead of my browser? Browsers can't make DNS-over-HTTPS requests to a resolver on another origin (CORS) and have no built-in DNS API, so the lookup runs server-side. Only Cloudflare's/Google's public DoH resolvers and the RDAP bootstrap registry (rdap.org, which redirects to whichever regional registry is authoritative) are queried — no other data is sent anywhere.
Why does "Hosting provider" say "Unknown"? The resolved IP's RDAP record didn't return an organization name — this happens occasionally for IP ranges with sparse registration data. The resolved IP itself is still accurate; try WHOIS Domain Lookup or IP Lookup for an alternate source.
Is this the same as a domain's registrar? No — the registrar is who you registered the domain name through (see WHOIS Domain Lookup). This tool reports who hosts the server the domain points to, which is often a completely different company.
Use it from code
From 3 credits per callREST API
curl -X POST https://api.iotools.cloud/v1/tool/domain-hosting-checker \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"domain": "cloudflare.com"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `domain-hosting-checker` tool (Domain Hosting Checker) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.