Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4YWW callsign genealogy
Currently held by Diaz JR, Pedro
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 KC4YWW's current licensee, walking backwards.
- Diaz Jr, PedroTXgranted 2013-04-02cancelled 2013-04-23
Successor callsigns
Callsigns held now by people who previously held KC4YWW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4YWW, oldest first.
- DIAZ JR, PEDRO FL1991-07-02 → cancelled 2003-07-03
- Diaz JR, Pedro TX2023-03-14 active