# HamNut.com

> Free amateur radio reference tools and API. Look up amateur radio call sign prefixes, inspect prefixes by country, map Maidenhead grid locators, convert coordinates through the API, and calculate magnetic loop antenna values. No registration required.

## Tools

- [Call Sign Prefix Search](https://hamnut.com/call-signs/prefixes/search): Search amateur radio call sign prefixes worldwide
- [Call Sign Prefixes by Country](https://hamnut.com/call-signs/prefixes/by-country): Browse prefixes grouped by country
- [Maidenhead Locator Tool](https://hamnut.com/geocode/locator): Map Maidenhead grid squares and view their center and boundary coordinates
- [Magnetic Loop Antenna Calculator](https://hamnut.com/calculators/magnetic-loop-antenna): Calculate magnetic loop antenna values by radius, material, and frequency

## API

- [API Documentation](https://hamnut.com/api): Free REST API for call sign prefix lookup and Maidenhead grid locator conversion. No authentication required for public endpoints.
- Useful for LLM agents and automated tools that need structured amateur radio data instead of scraping pages.
- [Full LLM Reference](https://hamnut.com/llms-full.txt): Extended site, API, data-source, and privacy reference.

## Legal

- [Privacy Policy](https://hamnut.com/privacy)
- [Cookie Policy](https://hamnut.com/cookies)
- [Terms and Conditions](https://hamnut.com/terms-and-conditions)