Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9DMS callsign genealogy
Currently held by SCHAEFER, DAVID 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 N9DMS's current licensee, walking backwards.
- Sapadin, David MILgranted 2015-03-03cancelled 2015-03-24
Successor callsigns
Callsigns held now by people who previously held N9DMS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9DMS, oldest first.
- SCHAEFER, DAVID J WI2004-06-09 → cancelled 2004-09-14
- Sapadin, David M IL2025-01-17 active