Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4OSX callsign genealogy
Currently held by RASMUSSEN, ZACHARY
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 K4OSX's current licensee, walking backwards.
- RASMUSSEN, ZACHARYUTgranted 2021-02-23cancelled 2021-03-13
Successor callsigns
Callsigns held now by people who previously held K4OSX.
No current licensee on record previously held this callsign.