Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB2JSB callsign genealogy
Currently held by CASTILLO, CHRISTOPHER W
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 KB2JSB's current licensee, walking backwards.
- Barcelo, Joseph SNJgranted 2012-11-21cancelled 2015-06-16
Successor callsigns
Callsigns held now by people who previously held KB2JSB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB2JSB, oldest first.
- CASTILLO, CHRISTOPHER W NY1990-03-20 → cancelled 2002-03-21
- Barcelo, Joseph S NJ2025-03-28 active