Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4WWW callsign genealogy
Currently held by MASTERSON, ROBBIE M
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 KC4WWW's current licensee, walking backwards.
- MASTERSON, ROBBIE MKYgranted 2024-02-15cancelled 2024-03-09
Successor callsigns
Callsigns held now by people who previously held KC4WWW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4WWW, oldest first.
- MASTERSON, ROBBIE M KY1991-03-19 → cancelled 2003-03-20
- MASTERSON, ROBBIE M KY2024-03-09 active