Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N7DER callsign genealogy
Currently held by HALVERSEN, MARK S
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 N7DER's current licensee, walking backwards.
- Reuter, David EORgranted 2021-10-13cancelled 2022-01-28
Successor callsigns
Callsigns held now by people who previously held N7DER.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7DER, oldest first.
- HALVERSEN, MARK S OR2003-06-26 → cancelled 2015-09-15
- Reuter, David E OR2022-01-28 active