Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WW4JMB callsign genealogy
Currently held by Billker, Jonathan 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 WW4JMB's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WW4JMB.
No current licensee on record previously held this callsign.