Start here · Essential guide
Ham Radio Call Sign Prefixes List
A practical list of ham radio call sign prefixes: how a call sign is built, who assigns prefix blocks, common country prefixes, and how to look one up.
Getting Started
Call Signs & Regions
5 guides, starting with Ham Radio Call Sign Prefixes List.
Azimuth Map for Ham Radio
What an azimuth map is for ham radio, how to read bearings, long path and true north, and how to generate one centered on your own station to aim a beam.
Ham Radio Call Area Map of the United States
A text guide to the ten US ham radio call areas, 0 through 9, listing the states in each, special cases like Alaska and Hawaii, and how to use a call area map.
Ham Radio Call Signs by Country: Prefix Blocks Explained
See how ITU prefix blocks map ham radio call signs to countries, with sample letter ranges, multi-block countries, territories and tips for looking up a call.
Ham Radio Regions and ITU Zones
Learn what ham radio regions mean: the three ITU regions, IARU regions, ITU and CQ zones, and how US call areas fit in, with notes on why regions matter.
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