Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB4RG callsign genealogy
Currently held by Grabowski, 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 KB4RG's current licensee, walking backwards.
- Grabowski, Robert AGAgranted 2008-10-20cancelled 2009-10-20
Successor callsigns
Callsigns held now by people who previously held KB4RG.
- Grabowski, Robert ATXgranted 2023-07-14