Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N7SDW callsign genealogy
Currently held by DURM, OLIVER A
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 N7SDW's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N7SDW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7SDW, oldest first.
- WELLS, ELIZABETH S WY1991-06-18 → cancelled 2003-06-19
- DURM, OLIVER A CO2018-11-27 active