Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4TUZ callsign genealogy
Currently held by Concejo Martinez, Guzman Concejo
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 KB4TUZ's current licensee, walking backwards.
- Concejo Martinez, GuzmanMDgranted 2025-05-15cancelled 2025-06-03
Successor callsigns
Callsigns held now by people who previously held KB4TUZ.
- MURPHY, WILLIAM JNCgranted 1988-02-23cancelled 2000-02-24