Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KU4UK callsign genealogy
Currently held by MCGUIRE PHD, RUSSELL C
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 KU4UK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KU4UK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KU4UK, oldest first.
- Crews, Leon AL1998-08-24 → cancelled 2009-02-27
- MCGUIRE PHD, RUSSELL C AL2023-08-15 active