Confidence: Medium · Source: FCC ULS · As of 2026-09-11
W4MPB callsign genealogy
Currently held by Forstner, Horace 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 W4MPB's current licensee, walking backwards.
- BALLMAN, MARK PVAgranted 2021-02-03cancelled 2021-04-16
Successor callsigns
Callsigns held now by people who previously held W4MPB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4MPB, oldest first.
- Forstner, Horace M GA2004-06-24 → cancelled 2005-06-19
- Ballman, Mark P VA2021-04-16 active