Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SPX callsign genealogy
Currently held by San Pedro, Matthew J
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 K4SPX's current licensee, walking backwards.
- San Pedro, Matthew JVAgranted 2024-02-21cancelled 2024-03-15
Successor callsigns
Callsigns held now by people who previously held K4SPX.
No current licensee on record previously held this callsign.