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Callook.info

Look up US ham radio callsigns and licensee details

📚 Open DataHEALTHYchecked 12h ago
AUTH NONECORS ✓AGENT ✓HTTPS ✓COMMERCIAL ?

Callook turns any United States amateur-radio callsign into structured JSON: license class, trustee, mailing address, grid square and lat/long. Append /json to a callsign and you're done — no key needed. The data traces back to the FCC's public ULS licensing records.

94HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: 94 · healthy
Uptime history
100%90 days
100%30 days
437P50 · ms
1156P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 116 ms, slowest 892 ms, most recent 118 ms.
Live response samplecaptured by our last successful check
GET https://callook.info/w1aw/json

{
  "status": "VALID",
  "type": "CLUB",
  "current": {
    "callsign": "W1AW",
    "operClass": ""
  },
  "trustee": {
    "callsign": "NA2AA",
    "name": "Minster, David A"
  },
  "name": "ARRL HQ OPERATORS CLUB",
  "location": {
    "latitude": "41.714707",
    "longitude": "-72.728411",
    "gridsquare": "FN31pr"
  }
}
Call itcurl · fetch · python
curl "https://callook.info/w1aw/json"
const res = await fetch("https://callook.info/w1aw/json");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://callook.info/w1aw/json")
print(res.json())
Endpoints · 5HealthyFULL DOCS ↗
Monitored path responding — GET /w1aw/json437 mschecked 12h ago
GET/w1aw/jsonPROBED

Look up US ham radio callsigns and licensee details

GET/w1aw

W1aw — documented GET route.

GET/w1aw/1

W1aw details by ID (example: 1).

GET/w1aw?limit=10

W1aw — documented GET route.

GET/w1aw/search?q=test

Search by query parameters.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

Callook.info: common questions

Is Callook.info free to use?

Yes — Callook.info is a free open data API. Free tier: Free — limits not published. Whether the free tier allows commercial use is unclear — check the provider docs.

Does Callook.info need an API key?

No — Callook.info needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).

Can I call Callook.info from the browser?

Yes — Callook.info returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.

Is Callook.info up right now?

As of our last scheduled check, Callook.info is healthy with 100% uptime over 90 days and a 437 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.