Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4ISY callsign genealogy
Currently held by Alton, Dawn
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 KD4ISY's current licensee, walking backwards.
- Alton, DawnUTgranted 2024-05-02cancelled 2024-05-21
Successor callsigns
Callsigns held now by people who previously held KD4ISY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4ISY, oldest first.
- PEREZ, ALBERT B AL2011-10-14 → cancelled 2024-01-09
- Alton, Dawn UT2024-05-21 active