Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR3D callsign genealogy
Currently held by O KEEFE, MICHAEL F
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 KR3D's current licensee, walking backwards.
- ROYCE, RALPH RTNgranted 2002-05-20cancelled 2003-09-05
Successor callsigns
Callsigns held now by people who previously held KR3D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KR3D, oldest first.
- O KEEFE, MICHAEL F PA1993-01-05 → cancelled 2001-01-08
- ROYCE, RALPH R TN2023-09-07 active