Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB9BS callsign genealogy
Currently held by Schifferdecker, Brian 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 AB9BS's current licensee, walking backwards.
- Schifferdecker, Brian SILgranted 2008-10-29cancelled 2018-04-24
Successor callsigns
Callsigns held now by people who previously held AB9BS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB9BS, oldest first.
- Steele, Samuel R WI2001-04-10 → cancelled 2013-04-11
- Schifferdecker, Brian S IL2018-04-24 active