Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9CTO callsign genealogy
Currently held by SCHUSTER, JOHN L
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 K9CTO's current licensee, walking backwards.
- SCHUSTER, JOHN LIAgranted 2013-10-24cancelled 2020-11-06
Successor callsigns
Callsigns held now by people who previously held K9CTO.
No current licensee on record previously held this callsign.