Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N0MDH callsign genealogy
Currently held by Heller, Michael D
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 N0MDH's current licensee, walking backwards.
- Heller, Michael DNJgranted 2020-01-15cancelled 2020-04-07
Successor callsigns
Callsigns held now by people who previously held N0MDH.
- Heller, Michael DNJgranted 2026-03-24
All historical holders
Every license row we've seen with the callsign N0MDH, oldest first.
- UTTER, LARRY C CO1990-06-26 → cancelled 2002-06-27
- Heller, Michael D NJ2020-04-07 → cancelled 2026-03-24