Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI0Z callsign genealogy
Currently held by Denker, Mark S
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 AI0Z's current licensee, walking backwards.
- Denker, Mark SMNgranted 2002-11-20cancelled 2005-05-06
Successor callsigns
Callsigns held now by people who previously held AI0Z.
- AVERY, MICHAEL JIAgranted 2022-04-26
All historical holders
Every license row we've seen with the callsign AI0Z, oldest first.
- AVERY, MICHAEL J CT1999-12-14 → cancelled 2002-05-25
- Denker, Mark S MN2025-02-14 active