Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4M callsign genealogy
Currently held by KRATZ, GERALD H
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 AF4M's current licensee, walking backwards.
- BULLA, DONALD HNCgranted 2014-07-14cancelled 2018-12-28
Successor callsigns
Callsigns held now by people who previously held AF4M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AF4M, oldest first.
- KRATZ, GERALD H FL2008-03-26 → cancelled 2016-12-09
- BULLA, DONALD H NC2018-12-28 active