Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WA4ZKO callsign genealogy
Currently held by Thomas, Jeffrey N
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 WA4ZKO's current licensee, walking backwards.
- THOMAS, JEFFREY NKYgranted 2001-12-14cancelled 2006-08-04
Successor callsigns
Callsigns held now by people who previously held WA4ZKO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4ZKO, oldest first.
- LOZE, JOHN E KY1998-12-09 → cancelled 2003-11-12
- Thomas, Jeffrey N KY2026-07-08 active