Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4EM callsign genealogy
Currently held by THORBURN, DONALD S
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 KK4EM's current licensee, walking backwards.
- Mundinger, Eric AALgranted 2020-11-24cancelled 2023-09-09
Successor callsigns
Callsigns held now by people who previously held KK4EM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4EM, oldest first.
- THORBURN, DONALD S FL2006-08-22 → cancelled 2018-10-18
- Mundinger, Eric A AL2023-09-09 active