Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB5OIL callsign genealogy
Currently held by Ellsworth, Robert A
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 KB5OIL's current licensee, walking backwards.
- Ellsworth, Robert AOKgranted 2007-12-20cancelled 2016-04-26
Successor callsigns
Callsigns held now by people who previously held KB5OIL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB5OIL, oldest first.
- CLARK, CHARLES C NM2001-02-02 → cancelled 2013-05-01
- Ellsworth, Robert A OK2016-04-26 active