Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SFO callsign genealogy
Currently held by Wilkerson, James 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 K4SFO's current licensee, walking backwards.
- Wilkerson, James MVAgranted 2007-07-19cancelled 2011-11-19
Successor callsigns
Callsigns held now by people who previously held K4SFO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SFO, oldest first.
- BURRAGE, WILLIAM R NC1997-12-16 → cancelled 2009-12-17
- Wilkerson, James M VA2023-03-17 active