Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NU8I callsign genealogy
Currently held by KROTZER, MATTHEW D
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 NU8I's current licensee, walking backwards.
- KROTZER, MATTHEW DOHgranted 2015-08-03cancelled 2021-04-23
Successor callsigns
Callsigns held now by people who previously held NU8I.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NU8I, oldest first.
- GREEN, ALFRED E AZ2009-02-12 → cancelled 2021-03-19
- KROTZER, MATTHEW D OH2021-04-23 active