Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0OLD callsign genealogy
Currently held by Umbenhower, Brian 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 K0OLD's current licensee, walking backwards.
- UMBENHOWER, BRIAN JMOgranted 2008-12-30cancelled 2009-03-24
Successor callsigns
Callsigns held now by people who previously held K0OLD.
No current licensee on record previously held this callsign.