Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO3D callsign genealogy
Currently held by PENTLAND, JAMES
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 KO3D's current licensee, walking backwards.
- COST, VAUGHN EPAgranted 2017-05-09cancelled 2021-08-31
Successor callsigns
Callsigns held now by people who previously held KO3D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO3D, oldest first.
- PENTLAND, JAMES PA1997-03-05 → cancelled 2009-03-06
- Brady, Christopher R PA2009-08-11 → cancelled 2021-08-12
- COST, VAUGHN E PA2021-08-31 active