Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0STF callsign genealogy
Currently held by Peterson, Steffanie
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 K0STF's current licensee, walking backwards.
- Peterson, SteffanieCOgranted 2014-09-11cancelled 2017-03-24
Successor callsigns
Callsigns held now by people who previously held K0STF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0STF, oldest first.
- Brand, Jack C SD2004-12-28 → cancelled 2017-02-22
- Peterson, Steffanie CO2017-03-24 active