Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0USA callsign genealogy
Currently held by HOROWITZ, BARRY P
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 KD0USA's current licensee, walking backwards.
- HOROWITZ, BARRY PFLgranted 2015-10-07cancelled 2017-02-24
Successor callsigns
Callsigns held now by people who previously held KD0USA.
- Quelland, Leonard HIAgranted 2020-06-24
All historical holders
Every license row we've seen with the callsign KD0USA, oldest first.
- Quelland, Leonard H IA2010-07-30 → cancelled 2013-09-27
- HOROWITZ, BARRY P FL2017-02-24 active