Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KJ0C callsign genealogy
Currently held by Maas, David J
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 KJ0C's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KJ0C.
- CROOKE, JAMES AMOgranted 2017-01-05
All historical holders
Every license row we've seen with the callsign KJ0C, oldest first.
- CROOKE, JAMES A MO2000-09-06 → cancelled 2007-03-16
- Maas, David J KS2019-06-04 active