Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KJ4MBK callsign genealogy
Currently held by Runninbear, Bobby J
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 KJ4MBK's current licensee, walking backwards.
- Keating, Joseph MGAgranted 2026-04-15cancelled 2026-05-05
Successor callsigns
Callsigns held now by people who previously held KJ4MBK.
- Runninbear, Bobby JTNgranted 2020-01-29
All historical holders
Every license row we've seen with the callsign KJ4MBK, oldest first.
- Runninbear, Bobby J TN2009-05-14 → cancelled 2010-04-20
- Keating, Joseph M GA2026-05-05 active