Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GRI callsign genealogy
Currently held by SULLIVAN, DANIEL
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 K4GRI's current licensee, walking backwards.
- Irish, George RFLgranted 2016-07-13cancelled 2017-03-12
Successor callsigns
Callsigns held now by people who previously held K4GRI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GRI, oldest first.
- SULLIVAN, DANIEL NC1998-05-19 → cancelled 2010-05-20
- Irish, George R FL2017-03-12 active