Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4BIL callsign genealogy
Currently held by BENDER, WILLIAM J
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 K4BIL's current licensee, walking backwards.
- BENDER SR, WILLIAM JFLgranted 2017-06-13cancelled 2021-06-29
Successor callsigns
Callsigns held now by people who previously held K4BIL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4BIL, oldest first.
- BARKER, BILLY SC2008-11-04 → cancelled 2021-01-29
- BENDER, WILLIAM J MO2021-06-29 active