Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT4JMB callsign genealogy
Currently held by Boulware Jr, John M
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 KT4JMB's current licensee, walking backwards.
- Boulware Jr, John MNCgranted 2024-11-22cancelled 2024-12-10
Successor callsigns
Callsigns held now by people who previously held KT4JMB.
- Boulware Jr, John MNCgranted 2025-08-29