Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0CSK callsign genealogy
Currently held by Keith, Justin
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 W0CSK's current licensee, walking backwards.
- Keith, JustinCOgranted 2021-03-30cancelled 2021-04-20
Successor callsigns
Callsigns held now by people who previously held W0CSK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0CSK, oldest first.
- JACKSON, EARL R MO1996-04-22 → cancelled 2008-04-23
- Keith, Justin CO2021-04-20 active