Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KA9MAT callsign genealogy
Currently held by Keippel, John B
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 KA9MAT's current licensee, walking backwards.
- Keippel, John BWIgranted 2026-06-04cancelled 2026-06-30
Successor callsigns
Callsigns held now by people who previously held KA9MAT.
- KEIPPEL, BARRY JWIgranted 2016-12-03
All historical holders
Every license row we've seen with the callsign KA9MAT, oldest first.
- KEIPPEL, BARRY J WI1997-08-05 → cancelled 2007-02-23
- Keippel, John B WI2026-06-30 active