Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4JZ callsign genealogy
Currently held by VILLEGAS, MARCO 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 KO4JZ's current licensee, walking backwards.
- Villegas, Marco SFLgranted 2014-07-22cancelled 2015-01-21
Successor callsigns
Callsigns held now by people who previously held KO4JZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4JZ, oldest first.
- VILLEGAS, MARCO S FL2001-08-24 → cancelled 2013-09-18
- Villegas, Marco S FL2015-01-21 active