Overview
Host.io aggregates domain data including DNS records, web technology fingerprints, backlinks, and related domains into a single REST API. It is widely used for competitive intelligence, brand monitoring, and cybersecurity research. The API requires an API key and returns detailed JSON profiles for any domain.
Beginner Tip
Sign up at host.io to get a free API key that allows a limited number of lookups per month. Pass your key as a query parameter (token=YOUR_KEY) alongside the domain you want to inspect. Start with the /api/web/ endpoint to see what technologies a site uses — it is the most beginner-friendly response.
Available Data
The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.
Example Response
Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.
{
"status": "success",
"data": {
"result": "Data from Host.io",
"description": "Domains Data API for Developers",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
domain The domain name queried. rank Estimated global traffic rank of the domain. ip List of IP addresses the domain resolves to. ns Nameservers currently authoritative for the domain. mx Mail exchange records associated with the domain. web Web technology details including title, description, and detected frameworks. Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://host.io/api/web/example.com?token=YOUR_API_KEY";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
headers: {
"X-API-Key": "YOUR_API_KEY"
}
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.
Metadata Score Breakdown
Estimated from metadata — endpoint not independently tested
Metadata estimate · endpoint not independently tested
Technical Specifications
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