Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4ZWU callsign genealogy
Currently held by BOYD, JOHN H
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 KD4ZWU's current licensee, walking backwards.
- Boyd, JohnTNgranted 2025-04-17cancelled 2025-07-01
Successor callsigns
Callsigns held now by people who previously held KD4ZWU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4ZWU, oldest first.
- BOYD, JOHN H SC2013-01-09 → cancelled 2025-04-08
- Boyd, John D TN2025-07-01 active