Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N6EIO callsign genealogy
Currently held by FOSTER, WILLIAM M
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 N6EIO's current licensee, walking backwards.
- Rosa, David MCAgranted 2013-05-13cancelled 2014-03-08
Successor callsigns
Callsigns held now by people who previously held N6EIO.
- FOSTER, WILLIAM MNVgranted 2007-12-14cancelled 2020-02-07
All historical holders
Every license row we've seen with the callsign N6EIO, oldest first.
- Rosa, David M CA2014-03-08 → cancelled 2026-03-10
- FOSTER, WILLIAM M— → cancelled 1998-02-06