Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0STJ callsign genealogy
Currently held by St John, Peter C
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 K0STJ's current licensee, walking backwards.
- St John, Peter CCOgranted 2020-11-02cancelled 2020-11-20
Successor callsigns
Callsigns held now by people who previously held K0STJ.
No current licensee on record previously held this callsign.