Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0RKF callsign genealogy
Currently held by FOSTER, RONALD K
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 W0RKF's current licensee, walking backwards.
- FOSTER, RONALD KCAgranted 2021-07-20cancelled 2022-10-21
Successor callsigns
Callsigns held now by people who previously held W0RKF.
- Foster, RonaldCAgranted 2025-12-16
All historical holders
Every license row we've seen with the callsign W0RKF, oldest first.
- KRABBE, FRED A IL1995-03-09 → cancelled 2007-03-10
- FOSTER, RONALD K CA2022-10-21 → cancelled 2025-12-16