uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

N1IFR callsign genealogy

Currently held by UNDERWOOD, JAMES E

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 N1IFR's current licensee, walking backwards.

  1. KB1OGJcancelled· G
    Grube III, Edward RVTgranted 2004-03-11cancelled 2007-02-08
  2. KB1KYGcancelled· G
    Grube III, Edward RVTgranted 2004-03-11cancelled 2006-12-13

Successor callsigns

Callsigns held now by people who previously held N1IFR.

  1. KL2KGactive· E
    Grube III, Edward RAKgranted 2016-12-23

All historical holders

Every license row we've seen with the callsign N1IFR, oldest first.

  • UNDERWOOD, JAMES E MA
    1990-11-20 → cancelled 2002-11-21
  • Grube III, Edward R AK
    2007-02-08 → cancelled 2008-04-05
← Back to N1IFR License history →