Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4JAS callsign genealogy
Currently held by Guetgemann, John J
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 KB4JAS's current licensee, walking backwards.
- Guetgemann, John JNCgranted 2014-12-24cancelled 2017-07-14
Successor callsigns
Callsigns held now by people who previously held KB4JAS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4JAS, oldest first.
- GRAY, LOUISE T FL1994-03-15 → cancelled 2006-03-16
- Guetgemann, John J NC2017-07-14 active