Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4ZAO callsign genealogy
Currently held by Keller, John 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 W4ZAO's current licensee, walking backwards.
- Keller A, John AVAgranted 2009-12-16cancelled 2010-01-05
Successor callsigns
Callsigns held now by people who previously held W4ZAO.
No current licensee on record previously held this callsign.