Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5GRC callsign genealogy
Currently held by Cosner, Guy 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 K5GRC's current licensee, walking backwards.
- Cosner, Guy RTXgranted 2017-05-25cancelled 2021-06-22
Successor callsigns
Callsigns held now by people who previously held K5GRC.
No current licensee on record previously held this callsign.