Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ATS callsign genealogy
Currently held by GRASSA, 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 N4ATS's current licensee, walking backwards.
- GRASSA, WILLIAM MFLgranted 1995-06-15cancelled 2000-01-04
Successor callsigns
Callsigns held now by people who previously held N4ATS.
No current licensee on record previously held this callsign.