Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD5IO callsign genealogy
Currently held by Willard, William D
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 AD5IO's current licensee, walking backwards.
- Hebert, Mark HTXgranted 2015-05-12cancelled 2015-05-30
Successor callsigns
Callsigns held now by people who previously held AD5IO.
- Willard, William DARgranted 2002-05-25cancelled 2002-12-10
All historical holders
Every license row we've seen with the callsign AD5IO, oldest first.
- Willard, William D AR2001-08-31 → cancelled 2002-05-25
- Hebert, Mark H TX2025-03-12 active