M
API Matrix

Host.io API

Development / API Key Intermediate HTTPS CORS
Varies by plan (check documentation)
82 Score
Grade A
Visit Official Site Compare Alternatives

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

Use case: Integrate domains data api for developers data into web and mobile applications
Host.io data via REST API
JSON-formatted response data
Requires API key authentication

Example Response

JSON 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 

const url = "https://host.io/";
// 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

401 Unauthorized Missing or invalid API key
✓ Ensure you pass token=YOUR_API_KEY as a query parameter in every request.
429 Too Many Requests Free-tier rate limit exceeded
✓ The free plan has monthly lookup limits; add delays between requests or upgrade to a paid plan.
Empty or null fields in response Host.io may not have data for less common domains
✓ Check if the domain is indexed; very new or obscure domains may return minimal data.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 10/20
🔒 Security 15/15
🛠 Developer XP 17/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS YES
Category Development
Difficulty Intermediate
Verified: 2026-04-04

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