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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

W3REZ callsign genealogy

Currently held by Zimmer, Robert 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 W3REZ's current licensee, walking backwards.

  1. N3UDactive· E
    BORTZ, DANIEL CPAgranted 2022-06-03
  2. KC3UDXcancelled· E
    BORTZ, DANIEL CPAgranted 2022-05-13cancelled 2022-06-03

Successor callsigns

Callsigns held now by people who previously held W3REZ.

  1. N3UDcancelled· E
    Zimmer, Robert EPAgranted 2019-12-17cancelled 2020-05-08
  2. WU3Sexpired· E
    KAISER, QUENTIN CMDgranted 2011-10-31cancelled 2024-01-23

All historical holders

Every license row we've seen with the callsign W3REZ, oldest first.

  • Zimmer, Robert E PA
    2019-03-22 → cancelled 2019-12-17
  • Zimmer, Robert E PA
    2020-05-08 active
← Back to W3REZ License history →