Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD0A callsign genealogy
Currently held by VERDUFT, JERRY L
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 AD0A's current licensee, walking backwards.
- Koelling, Terry LCOgranted 2024-06-15cancelled 2025-04-26
Successor callsigns
Callsigns held now by people who previously held AD0A.
- Koelling, Terry LCOgranted 2024-06-15cancelled 2025-04-26
All historical holders
Every license row we've seen with the callsign AD0A, oldest first.
- VERDUFT, JERRY L AZ2014-01-18 → cancelled 2022-04-28
- Koelling, Terry L CO2024-05-17 → cancelled 2024-06-15
- Koelling, Terry L CO2025-04-26 active