Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KB4JRT callsign genealogy
Currently held by Tombaugh Jr, John R
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 KB4JRT's current licensee, walking backwards.
- KF4WGOcancelledcancelled 1999-08-02
Successor callsigns
Callsigns held now by people who previously held KB4JRT.
- Tombaugh Jr, John RNCgranted 1999-08-02cancelled 2001-02-10