Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0UZP callsign genealogy
Currently held by SIMPSON, WILLIAM R
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 K0UZP's current licensee, walking backwards.
- SIMPSON, MASON CCOgranted 2022-01-10cancelled 2022-01-28
Successor callsigns
Callsigns held now by people who previously held K0UZP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0UZP, oldest first.
- SIMPSON, WILLIAM R CO2006-12-27 → cancelled 2019-02-27
- SIMPSON, MASON C CO2022-01-28 active