Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KS4TIM callsign genealogy
Currently held by SPERO, TIMOTHY 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 KS4TIM's current licensee, walking backwards.
- SPERO, TIMOTHY CNCgranted 2022-05-17cancelled 2022-06-04
Successor callsigns
Callsigns held now by people who previously held KS4TIM.
No current licensee on record previously held this callsign.