Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4MXB callsign genealogy
Currently held by HUMPHREY JR, JOHN C
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 KJ4MXB's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KJ4MXB.
- HUMPHREY JR, JOHN CNCgranted 2025-04-23