Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9RB callsign genealogy
Currently held by BOROWSKI, ROGER L
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 K9RB's current licensee, walking backwards.
- Borowski, Ronald SWIgranted 2015-04-03cancelled 2015-11-06
Successor callsigns
Callsigns held now by people who previously held K9RB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9RB, oldest first.
- BOROWSKI, ROGER L FL2006-09-09 → cancelled 2013-11-18
- Borowski, Ronald S WI2025-11-20 active