Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9CJP callsign genealogy
Currently held by Castillo Jr, Julio E
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 KC9CJP's current licensee, walking backwards.
- Parez, Charles JWIgranted 2017-04-17cancelled 2017-05-06
Successor callsigns
Callsigns held now by people who previously held KC9CJP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9CJP, oldest first.
- Castillo Jr, Julio E IL2002-09-10 → cancelled 2014-09-11
- Parez, Charles J WI2017-05-06 active