Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9GRN callsign genealogy
Currently held by Marx, John 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 K9GRN's current licensee, walking backwards.
- Marx, John CWIgranted 2005-09-23cancelled 2006-01-07
Successor callsigns
Callsigns held now by people who previously held K9GRN.
No current licensee on record previously held this callsign.