Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N7OSR callsign genealogy
Currently held by VASSAR, WILLIAM C
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 N7OSR's current licensee, walking backwards.
- HEYN, IAN IWAgranted 2021-01-20cancelled 2021-02-23
Successor callsigns
Callsigns held now by people who previously held N7OSR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N7OSR, oldest first.
- VASSAR, WILLIAM C SD2000-04-27 → cancelled 2012-05-02
- HEYN, IAN I WA2021-02-23 active