Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4BRB callsign genealogy
Currently held by BUTLER, BENJAMIN 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 KO4BRB's current licensee, walking backwards.
- BUTLER, BENJAMIN RTNgranted 2017-10-30cancelled 2017-11-17
Successor callsigns
Callsigns held now by people who previously held KO4BRB.
- BUTLER, BENJAMIN RTNgranted 2017-11-17