Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4YCB callsign genealogy
Currently held by BROWN, MATTHEW O
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 KC4YCB's current licensee, walking backwards.
- Brown, Matthew OALgranted 2010-03-15cancelled 2010-04-06
Successor callsigns
Callsigns held now by people who previously held KC4YCB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4YCB, oldest first.
- BROWN, MATTHEW O AL1991-03-26 → cancelled 2003-03-27
- Brown, Matthew O AL2020-01-24 active