shipapis
StarSubmit an APISubmit API

Callook.info

Look up US ham radio callsigns and licensee details

📚 Open DataUNMONITOREDchecked 13 min 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.

—HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: — · unmonitored
Uptime history
—%90 days
—%30 days
—P50 · ms
—P95 · ms
operationalpartialdownno data
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 · 5On scheduleFULL DOCS ↗
First rollup pending — GET /w1aw/json has been probed
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 You can call it straight away; rate limits still apply (Unpublished).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 unmonitored. We re-probe it every sweep — the status badge and uptime chart above always show the latest.