Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9GTO callsign genealogy
Currently held by Markos, 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 K9GTO's current licensee, walking backwards.
- Markos, John LWIgranted 2002-03-26cancelled 2002-04-30
Successor callsigns
Callsigns held now by people who previously held K9GTO.
No current licensee on record previously held this callsign.