Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1RIU callsign genealogy
Currently held by KRYSTOFOLSKI, JEFFREY W
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 N1RIU's current licensee, walking backwards.
- Krystofolski, Jeffrey WCTgranted 2014-04-21cancelled 2014-05-13
Successor callsigns
Callsigns held now by people who previously held N1RIU.
- KRYSTOFOLSKI, JEFFREY WFLgranted 2020-04-28
All historical holders
Every license row we've seen with the callsign N1RIU, oldest first.
- KRYSTOFOLSKI, JEFFREY W CT1994-02-08 → cancelled 2006-02-09
- KRYSTOFOLSKI, JEFFREY W FL2014-05-13 → cancelled 2020-04-28