Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4UDD callsign genealogy
Currently held by MENDELL, Mr. DOUGLAS 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 KO4UDD's current licensee, walking backwards.
- MENDELL, DOUGLAS RFLgranted 2016-03-15cancelled 2021-10-19
Successor callsigns
Callsigns held now by people who previously held KO4UDD.
No current licensee on record previously held this callsign.