Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4ACU callsign genealogy
Currently held by Pabst, David 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 KM4ACU's current licensee, walking backwards.
- REDDEN, JOSHUA MVAgranted 2024-09-07cancelled 2024-10-08
Successor callsigns
Callsigns held now by people who previously held KM4ACU.
- PABST, DAVID STNgranted 2025-11-21
All historical holders
Every license row we've seen with the callsign KM4ACU, oldest first.
- Pabst, David S TN2014-04-10 → cancelled 2014-04-29
- REDDEN, JOSHUA M VA2024-10-08 active