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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

W1IH callsign genealogy

Currently held by KATZ, JONATHAN 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 W1IH's current licensee, walking backwards.

  1. WE1Xactive· E
    TANKIN, HARRY JPAgranted 2020-04-15
  2. KC1SFactive
    Special Forces Brothers Amateur Radio ClubMAgranted 2025-04-01
  3. KC1DOAcancelled
    Special Forces Brothers Amateur Radio ClubMAgranted 2015-04-09cancelled 2015-04-28

Successor callsigns

Callsigns held now by people who previously held W1IH.

No current licensee on record previously held this callsign.

← Back to W1IH License history →