Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K3UK callsign genealogy
Currently held by RINGLEBEN, WILLIAM 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 K3UK's current licensee, walking backwards.
- O BRIEN, ANDREW JNYgranted 1999-02-25cancelled 2003-05-13
Successor callsigns
Callsigns held now by people who previously held K3UK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3UK, oldest first.
- RINGLEBEN, WILLIAM A PA1990-04-10 → cancelled 2002-04-11
- O BRIEN, ANDREW J NY2023-03-07 active