Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0ZRO callsign genealogy
Currently held by Avila, David M
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 W0ZRO's current licensee, walking backwards.
- Avila, David MCAgranted 2021-08-16cancelled 2021-09-03
Successor callsigns
Callsigns held now by people who previously held W0ZRO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0ZRO, oldest first.
- MACK, DENNIS A MN2008-01-05 → cancelled 2020-03-04
- Avila, David M CA2021-09-03 active