Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4BZ callsign genealogy
Currently held by Theriot, Frank P
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 K4BZ's current licensee, walking backwards.
- TERRY, HARLAN DFLgranted 2015-11-26cancelled 2023-06-09
Successor callsigns
Callsigns held now by people who previously held K4BZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4BZ, oldest first.
- Theriot, Frank P VA2014-04-16 → cancelled 2021-05-21
- TERRY, HARLAN D FL2023-06-09 active