Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4OOS callsign genealogy
Currently held by Cobb Sr, James 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 KM4OOS's current licensee, walking backwards.
- Cobb Sr, James CALgranted 2015-05-15cancelled 2015-11-03
Successor callsigns
Callsigns held now by people who previously held KM4OOS.
No current licensee on record previously held this callsign.