Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4RBT callsign genealogy
Currently held by MAHONE, FREDERICK 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 K4RBT's current licensee, walking backwards.
- MAHONE, FREDERICK AVAgranted 2004-08-04cancelled 2010-05-14
Successor callsigns
Callsigns held now by people who previously held K4RBT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RBT, oldest first.
- BLOUNT, GEORGE W NC1998-03-19 → cancelled 2010-03-20
- MAHONE, FREDERICK A VA2020-03-07 active