Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9CFL callsign genealogy
Currently held by Thorsen, Michael J
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 W9CFL's current licensee, walking backwards.
- Thorsen, Michael JWIgranted 2015-10-09cancelled 2015-12-11
Successor callsigns
Callsigns held now by people who previously held W9CFL.
- O'Kelly, Leonard AMIgranted 2018-01-03cancelled 2025-12-12
All historical holders
Every license row we've seen with the callsign W9CFL, oldest first.
- O'Kelly, Leonard A MI2005-09-07 → cancelled 2008-03-14
- Thorsen, Michael J WI2025-09-13 active