Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GRL callsign genealogy
Currently held by SUGIOKA, KENNETH
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 K4GRL's current licensee, walking backwards.
- Witherspoon, Sylvana CNCgranted 2020-09-28cancelled 2020-10-23
Successor callsigns
Callsigns held now by people who previously held K4GRL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GRL, oldest first.
- SUGIOKA, KENNETH NC2005-03-10 → cancelled 2017-06-01
- Witherspoon, Sylvana C NC2020-10-23 active