Callsign Lookup
Who holds a US callsign: amateur radio operators and FCC land-mobile licences.
Try:
US callsigns only. Amateur data from callook.info (FCC ULS); other licences from the i-c.biz FCC database. Limited to 30 lookups per 10 minutes.
Listen and decode with NyxScope
Hear who is on the air near you: NyxScope looks up FCC licences for any frequency, imports RadioReference and decodes trunked radio, DMR and more. NyxScope is a free multi-protocol SDR scanner for Windows from ICBizLabs, the team behind kilaz.com, with a 30-day trial of its licensed features.
About this tool
Amateur callsigns
US amateur licences are public FCC records: name, licence class (Technician, General, Amateur Extra), grid square and expiry. kilaz.com leaves out street addresses.
Other FCC licences
Businesses, cities, utilities and public-safety agencies hold land-mobile licences that list their frequencies. That's how scanner listeners find local systems.
Outside the US
Other countries keep their own databases (for example Ofcom in the UK or ISED in Canada) and aren't covered here.