Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K2GMM callsign genealogy
Currently held by MATZKE, WILLIAM F
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 K2GMM's current licensee, walking backwards.
- MATZKE, WILLIAM FWAgranted 2025-12-03cancelled 2025-12-30
Successor callsigns
Callsigns held now by people who previously held K2GMM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K2GMM, oldest first.
- FITZGERALD, JAMES H NJ1988-07-19 → cancelled 2000-07-20
- MATZKE, WILLIAM F WA2025-12-30 active