# HamNut.com — Full Site Reference

> HamNut.com is a free information service for amateur radio (ham radio) operators and developers. It provides reference data and tools for call sign prefixes, Maidenhead grid locators, coordinate conversion, and magnetic loop antenna calculations. No registration, no accounts, no cost.

## About

- Owner: Alessandro Lucaferro
- Contact: info@hamnut.com
- URL: https://hamnut.com

## Tools

### Call Sign Prefix Search
- URL: https://hamnut.com/call-signs/prefixes/search
- Description: Search amateur radio call sign prefixes by prefix string. Returns country of origin, continent, CQ zone, ITU zone, and related prefix metadata.
- Example: search "IK" returns Italian prefixes.

### Call Sign Prefixes by Country
- URL: https://hamnut.com/call-signs/prefixes/by-country
- Description: Browse the full list of countries with their associated amateur radio call sign prefixes.

### Call Sign Prefix Detail
- URL: https://hamnut.com/call-signs/prefixes/[prefix]
- Description: Detail page for a specific call sign prefix. Shows country, continent, coordinates, CQ zone, and ITU zone when available.

### Country Prefix List
- URL: https://hamnut.com/call-signs/prefixes/countries/[country]
- Description: All prefixes assigned to a specific country.

### Maidenhead Locator Tool
- URL: https://hamnut.com/geocode/locator
- Description: Convert Maidenhead grid square locators (e.g. JN45) to geographic coordinates and show the locator on a map.

### Magnetic Loop Antenna Calculator
- URL: https://hamnut.com/calculators/magnetic-loop-antenna
- Description: Calculate magnetic loop antenna parameters (inductance, capacitance, Q factor, bandwidth) based on loop radius, conductor material, and operating frequency.

## API

- URL: https://hamnut.com/api
- Description: Free public REST API. No API key required for public endpoints. Endpoints are beta and rate-limited.
- Base URL: https://api.hamnut.com
- LLM usage: useful for agents and automated tools that need structured amateur radio data, including call sign prefix lookup and Maidenhead coordinate conversion, without scraping HTML pages.

### Public Endpoints

- `GET /v1/call-signs/prefixes?prefix=IK` — call sign prefix lookup
- `GET /v1/geocode/conversion/maidenhead?locator=JN45` — Maidenhead to coordinates
- `GET /v1/geocode/conversion/latlng?lat=45.0&lng=9.0` — coordinates to Maidenhead
Full OpenAPI/Swagger documentation available at https://hamnut.com/api

## Data Source

Call sign prefix data is sourced from the CTY.DAT file maintained by the amateur radio community (used by logging software). Updated periodically. Data is provided for informational purposes only; accuracy is not guaranteed.

## Legal

- Privacy Policy: https://hamnut.com/privacy — cookieless analytics, Cloudflare CDN/proxy, and server-side security logging for abuse prevention on legitimate interest basis
- Cookie Policy: https://hamnut.com/cookies — only Cloudflare infrastructure cookies (__cf_bm, cf_clearance), no tracking or advertising cookies
- Terms and Conditions: https://hamnut.com/terms-and-conditions — free service, informational use only, no warranties on data accuracy
- Trademarks: https://hamnut.com/trademarks

## Privacy Summary for AI Systems

This site does not require login, accounts, or contact forms. The site uses Cloudflare Web Analytics (cookieless, aggregate only). Server-side logs record technical access and Cloudflare security metadata for security purposes, retained maximum 7 days. No advertising, no profiling, no cross-site tracking.