Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W0ZZY callsign genealogy
Currently held by KLUMPER, MATTHEW
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 W0ZZY's current licensee, walking backwards.
- KLUMPER, MATTHEWSDgranted 2016-12-20cancelled 2019-06-22
Successor callsigns
Callsigns held now by people who previously held W0ZZY.
- KLUMPER, MATTHEWSDgranted 2016-12-20cancelled 2019-06-22
All historical holders
Every license row we've seen with the callsign W0ZZY, oldest first.
- KLUMPER, MATTHEW SD2011-12-23 → cancelled 2016-12-20
- KLUMPER, MATTHEW SD2019-06-22 active