Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WK4O callsign genealogy
Currently held by WEATHERFORD, MATTHEW B
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 WK4O's current licensee, walking backwards.
- WEATHERFORD, MATTHEW BVAgranted 2013-01-16cancelled 2013-06-25
Successor callsigns
Callsigns held now by people who previously held WK4O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WK4O, oldest first.
- RUSSELL JR, EARL H SC2001-03-20 → cancelled 2013-06-05
- WEATHERFORD, MATTHEW B VA2023-04-05 active