Call Sign Prefix Search
Look up call sign prefixes and identify country allocations, ITU and CQ zones, and geographic details quickly and easily.
Awaiting query
Welcome to HamNut
Welcome to HamNut, your go-to destination for all things ham radio! Our website offers a variety of resources for ham radio enthusiasts, including a call sign prefix search and a lookup tool for Maidenhead grid locators.
Maidenhead Grid & Geocode Locator
Lookup and convert between geographical coordinates, addresses, and Maidenhead grid locators (QTH locators).
Awaiting query
Magnetic Loop Antenna
Calculate magnetic loop antenna dimensions, efficiency, bandwidth, and tuning values.
Available calculator
- Magnetic Loop Antenna
Developer Resources
Free API for Developers
In addition to our website resources, HamNut also offers a free API for developers to access our data. This API allows you to easily integrate our call sign prefix search and Maidenhead grid locator lookup into your projects. Whether you're building a mobile app or a custom website, our API makes it simple to access the information you need. Thank you for choosing HamNut!
hamnut-api-response.json HTTP 200 OK
{
"status": "ok",
"found": true,
"countryName": "Italy",
"cqZone": 15,
"ituZone": 28,
"continent": "EU",
"prefix": "I",
"countryCode": "IT",
"primaryDXCCPrefix": "I",
"timeOffset": "1h 0m",
"localTime": "2026-09-14T08:59:39+01:00",
"_t": "2026-09-14T07:59:39Z"
}Whether you're a seasoned pro or just getting started, we have something for everyone. Thanks for visiting!