Callook.info

API

Free JSON API for United States ham radio callsign data

Overview

The Callook.info API provides RESTful access to public FCC data for United States ham radio callsigns. Its core endpoint allows GET requests for specific callsigns (e.g., /api/{callsign}), returning JSON responses with details like license class, operator name, address, grant/expiration dates, and FCC region. Use cases include integrating callsign lookup into contest logging apps, QSL card verification tools, ham radio community directories, or hobbyist projects to access official license data efficiently.

Example Integration (JavaScript)

script.js JS


fetch('https://callook.info')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful
JSON support
No Auth Required
FCC Ham Radio Data
Callsign Lookup Endpoint

Frequently Asked Questions

? Is Callook.info free to use?

Yes, the Callook.info API is completely free for accessing United States ham radio callsign data.

? Does it require an API Key?

No, the API does not require authentication or an API key for access.

? What is the response format?

The API returns responses in JSON format, containing structured details about the requested callsign.

Top Alternatives

Tool Info

Pricing Free

Category Open Data

Platform Public API

Pros

⊕ Free to use
⊕ Simple GET requests
⊕ Comprehensive license details
⊕ Official FCC data source

Cons

⊖ US-only coverage
⊖ Potential rate limits
⊖ No SLA
⊖ Limited advanced features