Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WX4JMS callsign genealogy
Currently held by Sibley, 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 WX4JMS's current licensee, walking backwards.
- Sibley, John MGAgranted 2008-05-08cancelled 2008-05-28
Successor callsigns
Callsigns held now by people who previously held WX4JMS.
No current licensee on record previously held this callsign.