Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9GFS callsign genealogy
Currently held by Greenblatt, Matthew J
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 K9GFS's current licensee, walking backwards.
- Greenblatt, Matthew JWIgranted 2010-01-11cancelled 2010-01-30
Successor callsigns
Callsigns held now by people who previously held K9GFS.
- Greenblatt, Matthew JWIgranted 2020-12-16