Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4JSL callsign genealogy
Currently held by KRATZMAIER, PAUL
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 KB4JSL's current licensee, walking backwards.
- Perry, Michael GTXgranted 2013-02-26cancelled 2021-12-24
Successor callsigns
Callsigns held now by people who previously held KB4JSL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4JSL, oldest first.
- KRATZMAIER, PAUL FL1988-11-22 → cancelled 2000-11-28
- Perry, Michael G TX2021-12-24 active