Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4MRS callsign genealogy
Currently held by GRASSBAUGH, JAMES 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 N4MRS's current licensee, walking backwards.
- KM4OJScancelledMarshall County Amateur Radio SocietyTNgranted 2015-10-26cancelled 2015-12-04
Successor callsigns
Callsigns held now by people who previously held N4MRS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4MRS, oldest first.
- GRASSBAUGH, JAMES J FL1995-04-27 → cancelled 2007-04-28
- Marshall County Amateur Radio Society TN2025-12-17 active