Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NI1U callsign genealogy
Currently held by GUILFORD RADIO SOCIETY
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 NI1U's current licensee, walking backwards.
- HELDT, MICHAELCAgranted 2020-07-13cancelled 2021-05-22
Successor callsigns
Callsigns held now by people who previously held NI1U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NI1U, oldest first.
- MAGNESS, CLARK S CT1998-06-25 → cancelled 1998-11-08
- GUILFORD RADIO SOCIETY CT2009-03-21 → cancelled 2021-05-01
- HELDT, MICHAEL CA2021-05-22 active