Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NN4JM callsign genealogy
Currently held by McDowell IV, James
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 NN4JM's current licensee, walking backwards.
- MOORE, JENNIFER AALgranted 2016-04-12cancelled 2021-06-02
Successor callsigns
Callsigns held now by people who previously held NN4JM.
- McDowell IV, JamesOHgranted 2019-04-16cancelled 2020-03-07
All historical holders
Every license row we've seen with the callsign NN4JM, oldest first.
- McDowell IV, James OH2017-11-28 → cancelled 2019-04-16
- MOORE, JENNIFER A AL2021-06-02 active