Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0YC callsign genealogy
Currently held by Mearns, Mark I
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 K0YC's current licensee, walking backwards.
- Mearns, Mark ICOgranted 2015-10-26cancelled 2019-08-27
Successor callsigns
Callsigns held now by people who previously held K0YC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0YC, oldest first.
- OBER MR., HAROLD E IA2007-07-17 → cancelled 2019-08-07
- Mearns, Mark I CO2019-08-27 active