Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9UF callsign genealogy
Currently held by Guenther, David 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 K9UF's current licensee, walking backwards.
- Guenther, David AILgranted 2007-09-25cancelled 2008-06-27
Successor callsigns
Callsigns held now by people who previously held K9UF.
- SPECKETER, STEPHEN DILgranted 2025-12-02
All historical holders
Every license row we've seen with the callsign K9UF, oldest first.
- SPECKETER, STEPHEN D IL1997-02-12 → cancelled 2006-01-10
- Guenther, David A IL2018-04-10 active