Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4COZ callsign genealogy
Currently held by OSWALD, CHRISTOPHER A
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 K4COZ's current licensee, walking backwards.
- OSWALD, CHRISTOPHER AFLgranted 2012-01-04cancelled 2012-01-24
Successor callsigns
Callsigns held now by people who previously held K4COZ.
No current licensee on record previously held this callsign.