Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K5UCO callsign genealogy
Currently held by LAMB JR, SEAN R
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 K5UCO's current licensee, walking backwards.
- LAMB JR, SEAN RARgranted 2022-03-10cancelled 2025-03-25
Successor callsigns
Callsigns held now by people who previously held K5UCO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5UCO, oldest first.
- WILLIS JR, LEO K TX1996-12-03 → cancelled 2008-12-04
- LAMB JR, SEAN R AR2025-03-25 active