Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NO7ON callsign genealogy
Currently held by PFEIFFER, 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 NO7ON's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NO7ON.
- PFEIFFER, MICHAEL DCAgranted 2013-11-30cancelled 2016-02-19
All historical holders
Every license row we've seen with the callsign NO7ON, oldest first.
- PFEIFFER, MICHAEL D AZ2013-01-01 → cancelled 2013-11-30
- PFEIFFER, MIKE TX2025-12-10 active