Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0BI callsign genealogy
Currently held by WALKER, SHAWN
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 AC0BI's current licensee, walking backwards.
- WALKER, SHAWNCOgranted 2020-11-12cancelled 2020-12-04
Successor callsigns
Callsigns held now by people who previously held AC0BI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC0BI, oldest first.
- Walker, Shawn K CO2005-04-08 → cancelled 2017-06-28
- WALKER, SHAWN CO2020-12-04 active