Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0BLL callsign genealogy
Currently held by Underhill, Brian
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 K0BLL's current licensee, walking backwards.
- Underhill, BrianCOgranted 2009-07-08cancelled 2017-09-29
Successor callsigns
Callsigns held now by people who previously held K0BLL.
No current licensee on record previously held this callsign.