Overview
Callook.info is a free API that lets you look up United States amateur (ham) radio callsigns. No API key is required, making it very easy to get started. It returns structured data about the licensee including their name, location, and license class.
Beginner Tip
Simply append a callsign to the base URL (e.g., /W1AW) to retrieve license details. Add /data.json to the path to get a clean JSON 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 Callook.info",
"description": "United States ham radio callsigns",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
status License status, typically VALID or INVALID. type Type of license, such as PERSON or CLUB. name Object containing first and last name of the licensee. address Mailing address associated with the license. location Latitude and longitude of the licensee location. otherInfo Additional details including license class, grant date, and expiry date. Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://callook.info/W1AW/data.json";
const response = await fetch(url);
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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