Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4STP callsign genealogy
Currently held by Phillips, Grover S
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 KO4STP's current licensee, walking backwards.
- Phillips, Grover SNCgranted 2021-04-30cancelled 2021-06-15
Successor callsigns
Callsigns held now by people who previously held KO4STP.
No current licensee on record previously held this callsign.