Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4UAB callsign genealogy
Currently held by Mathews, John 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 KJ4UAB's current licensee, walking backwards.
- Mathews, John ATNgranted 2010-03-12cancelled 2010-04-08
Successor callsigns
Callsigns held now by people who previously held KJ4UAB.
- Mathews, John ATNgranted 2020-02-06