Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4RRJ callsign genealogy
Currently held by MC KINLEY, BRIAN P
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 K4RRJ's current licensee, walking backwards.
- Russo, Roberto JFLgranted 2025-06-24cancelled 2025-07-15
Successor callsigns
Callsigns held now by people who previously held K4RRJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RRJ, oldest first.
- MC KINLEY, BRIAN P TN2012-02-07 → cancelled 2024-02-08
- Russo, Roberto J FL2025-07-15 active