Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W5FTL callsign genealogy
Currently held by Knab, Michael S
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 W5FTL's current licensee, walking backwards.
- Knab, Michael STXgranted 2015-07-29cancelled 2017-08-04
Successor callsigns
Callsigns held now by people who previously held W5FTL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W5FTL, oldest first.
- KLAPETZKY, ALBERT J TX1996-11-04 → cancelled 2008-11-05
- Knab, Michael S UT2017-08-04 active