Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W0ZDT callsign genealogy
Currently held by SPENCER AMATEUR RADIO KLUB
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 W0ZDT's current licensee, walking backwards.
- KLUMPER, MATTHEWSDgranted 2019-06-22
Successor callsigns
Callsigns held now by people who previously held W0ZDT.
- KLUMPER, MATTHEWSDgranted 2019-06-22
All historical holders
Every license row we've seen with the callsign W0ZDT, oldest first.
- SPENCER AMATEUR RADIO KLUB IA1996-02-05 → cancelled 2008-02-06
- KLUMPER, MATTHEW SD2016-12-20 → cancelled 2019-06-22