Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD8O callsign genealogy
Currently held by SHERMAN, DAVID R
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 AD8O's current licensee, walking backwards.
- Knitter, James RAZgranted 2010-12-07cancelled 2011-08-12
Successor callsigns
Callsigns held now by people who previously held AD8O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD8O, oldest first.
- SHERMAN, DAVID R AL1998-07-27 → cancelled 2010-07-28
- Knitter, James R AZ2021-11-16 active