Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9TX callsign genealogy
Currently held by Koester, William H
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 W9TX's current licensee, walking backwards.
- White, David KWIgranted 2007-03-15cancelled 2012-03-10
Successor callsigns
Callsigns held now by people who previously held W9TX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9TX, oldest first.
- Koester, William H KY2001-01-04 → cancelled 2010-02-19
- White, David K WI2022-02-01 active