Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WU9J callsign genealogy
Currently held by JOHNSON, LLOYD L
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 WU9J's current licensee, walking backwards.
- Einboeck, FridolinCAgranted 2022-01-21cancelled 2023-11-10
Successor callsigns
Callsigns held now by people who previously held WU9J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WU9J, oldest first.
- JOHNSON, LLOYD L IL2011-12-06 → cancelled 2022-08-09
- Einboeck, Fridolin CA2023-11-10 active