Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SSS callsign genealogy
Currently held by Grezak, David P
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 K0SSS's current licensee, walking backwards.
- Porciuncula, Sherwin VNVgranted 2021-08-09cancelled 2021-08-27
Successor callsigns
Callsigns held now by people who previously held K0SSS.
- Grezak, David PCOgranted 2026-07-29
All historical holders
Every license row we've seen with the callsign K0SSS, oldest first.
- Grezak, David P CO2011-03-15 → cancelled 2016-10-21
- Porciuncula, Sherwin V NV2021-08-27 active