Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5FMM callsign genealogy
Currently held by MAYER, FREDERICK M
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K5FMM's current licensee, walking backwards.
- Mayer, Frederick MLAgranted 2007-05-10cancelled 2007-11-20
Successor callsigns
Callsigns held now by people who previously held K5FMM.
No current licensee on record previously held this callsign.