Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N8OSR callsign genealogy
Currently held by Christophersen, Michael 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 N8OSR's current licensee, walking backwards.
- Christophersen, Michael AMIgranted 2015-05-21cancelled 2015-06-09
Successor callsigns
Callsigns held now by people who previously held N8OSR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N8OSR, oldest first.
- CHRISTOPHERSEN, GREGORY A MI2001-02-28 → cancelled 2013-05-29
- Christophersen, Michael A MI2015-06-09 active