Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NY1U callsign genealogy
Currently held by GRIMALDI SR, MICHAEL J
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 NY1U's current licensee, walking backwards.
- GRIMALDI SR, MICHAEL JCTgranted 2016-10-18cancelled 2023-09-19
Successor callsigns
Callsigns held now by people who previously held NY1U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NY1U, oldest first.
- O DWYER, MICHAEL J MA2011-08-16 → cancelled 2023-08-29
- GRIMALDI SR, MICHAEL J CT2023-09-19 active