Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4ZUY callsign genealogy
Currently held by Holmes, Michael S
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 K4ZUY's current licensee, walking backwards.
- Holmes, Michael STNgranted 2023-03-29cancelled 2023-04-18
Successor callsigns
Callsigns held now by people who previously held K4ZUY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4ZUY, oldest first.
- HALE, JACK L TN1990-07-31 → cancelled 2002-08-01
- Holmes, Michael S TN2023-04-18 active