Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD5KU callsign genealogy
Currently held by THRELFALL, HENRY 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 KD5KU's current licensee, walking backwards.
- UPDEGRAFF, KEVIN STXgranted 2010-10-22cancelled 2011-10-12
Successor callsigns
Callsigns held now by people who previously held KD5KU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD5KU, oldest first.
- THRELFALL, HENRY A AZ1997-08-13 → cancelled 2009-08-14
- UPDEGRAFF, KEVIN S TX2021-10-19 active