Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0HMZ callsign genealogy
Currently held by Barnstorf, Jeffrey A
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 W0HMZ's current licensee, walking backwards.
- Barnstorf, Jeffrey ACOgranted 2016-04-18cancelled 2016-05-07
Successor callsigns
Callsigns held now by people who previously held W0HMZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0HMZ, oldest first.
- TROST, CLARENCE W KS1996-06-19 → cancelled 2008-06-20
- Barnstorf, Jeffrey A CO2016-05-07 active