Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9COT callsign genealogy
Currently held by MUELLER JR, ROBERT P
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 K9COT's current licensee, walking backwards.
- Mueller Jr, Robert PILgranted 2010-04-06cancelled 2011-04-08
Successor callsigns
Callsigns held now by people who previously held K9COT.
No current licensee on record previously held this callsign.