Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9ZAP callsign genealogy
Currently held by HORNDASCH, THOMAS 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 K9ZAP's current licensee, walking backwards.
- HORNDASCH, THOMAS JILgranted 1993-10-26cancelled 2000-12-30
- KA9TDOno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held K9ZAP.
No current licensee on record previously held this callsign.