Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD3U callsign genealogy
Currently held by FOEHRKOLB III, JOSEPH J
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 WD3U's current licensee, walking backwards.
- FOEHRKOLB III, JOSEPH JMDgranted 2012-06-26cancelled 2018-04-20
Successor callsigns
Callsigns held now by people who previously held WD3U.
- SWARTZ, DONALD GPAgranted 1996-11-04cancelled 1999-03-19
All historical holders
Every license row we've seen with the callsign WD3U, oldest first.
- Bird, Douglas E MS2006-03-31 → cancelled 2018-04-03
- FOEHRKOLB III, JOSEPH J MD2018-04-20 active