Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4SB callsign genealogy
Currently held by SPIVEY, JOHN 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 KC4SB's current licensee, walking backwards.
- Bonilla, SantiagoFLgranted 2017-03-13cancelled 2020-06-13
Successor callsigns
Callsigns held now by people who previously held KC4SB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4SB, oldest first.
- SPIVEY, JOHN M GA2005-08-01 → cancelled 2017-10-28
- Bonilla, Santiago FL2020-06-13 active