Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4UBU callsign genealogy
Currently held by Hughes, Christopher D
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 K4UBU's current licensee, walking backwards.
- Hughes, Christopher DCOgranted 2020-09-24cancelled 2020-10-16
Successor callsigns
Callsigns held now by people who previously held K4UBU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4UBU, oldest first.
- HUGHES, ROBERT D CO1989-12-12 → cancelled 2002-03-07
- Hughes, Christopher D CO2020-10-16 active