Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SLY callsign genealogy
Currently held by Brown, John B
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 K4SLY's current licensee, walking backwards.
- Lelak, Michael MFLgranted 2026-04-04cancelled 2026-04-24
Successor callsigns
Callsigns held now by people who previously held K4SLY.
- Sly, Randolph WVAgranted 2004-04-20cancelled 2005-06-07
All historical holders
Every license row we've seen with the callsign K4SLY, oldest first.
- SLY, RANDOLPH W VA2003-03-08 → cancelled 2004-04-20
- Brown, John B GA2011-04-19 → cancelled 2023-04-20
- Lelak, Michael M FL2026-04-24 active