Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4GRM callsign genealogy
Currently held by McCord Jr, George 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 N4GRM's current licensee, walking backwards.
- McCord Jr, George RFLgranted 2021-10-26cancelled 2024-02-13
Successor callsigns
Callsigns held now by people who previously held N4GRM.
- O'Brien, Michael DFLgranted 2017-05-25
All historical holders
Every license row we've seen with the callsign N4GRM, oldest first.
- O'Brien, Michael D FL2007-07-03 → cancelled 2007-07-28
- McCord Jr, George R FL2024-02-13 active