Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4WU callsign genealogy
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 KK4WU's current licensee, walking backwards.
- Uthoff, William FTNgranted 2012-08-20cancelled 2013-11-09
Successor callsigns
Callsigns held now by people who previously held KK4WU.
- LAWRENCE, DONALD HALgranted 2008-03-07cancelled 2020-03-27
All historical holders
Every license row we've seen with the callsign KK4WU, oldest first.
- Uthoff, William F TN2023-08-15 active
- —— → cancelled 1998-03-26