Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9UK callsign genealogy
Currently held by LAYTON, JOHN 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 W9UK's current licensee, walking backwards.
- Birkey, JonathanILgranted 2024-12-10cancelled 2025-09-26
Successor callsigns
Callsigns held now by people who previously held W9UK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9UK, oldest first.
- LAYTON, JOHN L PA2013-07-12 → cancelled 2025-09-09
- Birkey, Jonathan IL2025-09-26 active