Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB4JON callsign genealogy
Currently held by Martin, Jonathan D
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 WB4JON's current licensee, walking backwards.
- Martin, Jonathan DCAgranted 2017-11-27cancelled 2017-12-29
Successor callsigns
Callsigns held now by people who previously held WB4JON.
No current licensee on record previously held this callsign.