Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY3D callsign genealogy
Currently held by HOLBROOK, MARK A
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 KY3D's current licensee, walking backwards.
- HOLBROOK, MARK AKYgranted 2009-06-25cancelled 2009-07-17
Successor callsigns
Callsigns held now by people who previously held KY3D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KY3D, oldest first.
- BLASCO, RICHARD W PA1995-06-15 → cancelled 1997-06-10
- HOLBROOK, MARK A KY2019-04-30 active