Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA4ESQ callsign genealogy
Currently held by Simon, Michael L
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 KA4ESQ's current licensee, walking backwards.
- TONOLETE, FERNANDO TVAgranted 1999-11-16cancelled 2007-08-21
- KB6LUQno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KA4ESQ.
- Simon, Michael LAZgranted 2022-06-10
All historical holders
Every license row we've seen with the callsign KA4ESQ, oldest first.
- Simon, Michael L AZ2002-03-26 → cancelled 2002-05-18
- TONOLETE, FERNANDO T VA2017-06-16 active