Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4WIS callsign genealogy
Currently held by Efird, 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 WB4WIS's current licensee, walking backwards.
- Efird, John MFLgranted 2025-09-30cancelled 2025-12-09
Successor callsigns
Callsigns held now by people who previously held WB4WIS.
No current licensee on record previously held this callsign.