Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9FAN callsign genealogy
Currently held by ZIMMERMANN, LOUIS 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 W9FAN's current licensee, walking backwards.
- Zimmermann, Louis HILgranted 2007-02-07cancelled 2007-03-20
Successor callsigns
Callsigns held now by people who previously held W9FAN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9FAN, oldest first.
- ZIMMERMANN, LOUIS H IL2002-04-10 → cancelled 2006-05-11
- Zimmermann, Louis H IL2017-01-05 active