Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0JSF callsign genealogy
Currently held by ESQUIVEL, ANTHONY
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 K0JSF's current licensee, walking backwards.
- Fierro III, Julian SCOgranted 2018-01-16cancelled 2018-02-13
Successor callsigns
Callsigns held now by people who previously held K0JSF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0JSF, oldest first.
- ESQUIVEL, ANTHONY NE1994-03-22 → cancelled 2006-03-23
- Fierro III, Julian S CO2018-02-13 active