Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AA4ZH callsign genealogy
Currently held by Haidari, Zach J
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 AA4ZH's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AA4ZH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA4ZH, oldest first.
- MC PHERSON, DONALD R TN1996-09-16 → cancelled 2008-09-17
- Haidari, Zach J CA2016-08-02 active