Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB7IZO callsign genealogy
Currently held by Karren, Bryson 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 KB7IZO's current licensee, walking backwards.
- Karren, Bryson MMTgranted 2010-05-18cancelled 2010-11-02
Successor callsigns
Callsigns held now by people who previously held KB7IZO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB7IZO, oldest first.
- ROBERTS, JESS B MT1999-12-24 → cancelled 2004-05-09
- Karren, Bryson M CO2021-03-16 active