Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4SQQ callsign genealogy
Currently held by Greiner, Jason D
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 KO4SQQ's current licensee, walking backwards.
- Greiner, Jason DTNgranted 2021-08-17cancelled 2022-04-12
Successor callsigns
Callsigns held now by people who previously held KO4SQQ.
- Greiner, Jason DTNgranted 2021-08-17cancelled 2022-04-12
All historical holders
Every license row we've seen with the callsign KO4SQQ, oldest first.
- Greiner, Jason D TN2021-08-17 → cancelled 2022-03-23
- Greiner, Jason D TN2022-04-12 active