Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD1DX callsign genealogy
Currently held by STIEBLER, WOLFRAM 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 WD1DX's current licensee, walking backwards.
- STIEBLER, WOLFRAM CMAgranted 2016-10-25cancelled 2022-04-15
Successor callsigns
Callsigns held now by people who previously held WD1DX.
- Bolduc, David MNHgranted 2019-03-12
All historical holders
Every license row we've seen with the callsign WD1DX, oldest first.
- Bolduc, David M NH2017-07-21 → cancelled 2019-03-12
- STIEBLER, WOLFRAM C MA2022-04-15 active