Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KG4GRF callsign genealogy
Currently held by BLACKWOOD I, MICHAEL R
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 KG4GRF's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KG4GRF.
- BLACKWOOD I, MICHAEL RPAgranted 2010-01-08cancelled 2015-02-19