Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD1Z callsign genealogy
Currently held by ERDMANN, BILL F
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 KD1Z's current licensee, walking backwards.
- ERDMANN, BILL FWIgranted 2020-06-01cancelled 2021-03-09
Successor callsigns
Callsigns held now by people who previously held KD1Z.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD1Z, oldest first.
- GODWIN, STEPHEN B AL2011-03-26 → cancelled 2019-02-12
- ERDMANN, BILL F WI2021-03-09 active