Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9FFF callsign genealogy
Currently held by Klechak, Sean 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 W9FFF's current licensee, walking backwards.
- Klechak, Sean AILgranted 2013-09-06cancelled 2014-07-15
Successor callsigns
Callsigns held now by people who previously held W9FFF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9FFF, oldest first.
- FISTS OF ILLINOIS IL2000-06-24 → cancelled 2012-06-26
- Klechak, Sean a IL2024-06-25 active