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

W0RTT callsign genealogy

Currently held by GRILLO, PETER H

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 W0RTT's current licensee, walking backwards.

  1. W3MCactive· E
    SANDERSON, HUGH VMSgranted 2026-05-02
  2. N5IJYcancelled· E
    SANDERSON, HUGH VMSgranted 2015-04-17cancelled 2016-07-06

Successor callsigns

Callsigns held now by people who previously held W0RTT.

  1. W0VTTactive· E
    CIZEK, MICHAEL GMNgranted 2024-04-17

All historical holders

Every license row we've seen with the callsign W0RTT, oldest first.

  • GRILLO, PETER H CO
    1998-01-14 → cancelled 2010-01-15
  • CIZEK, MICHAEL G MN
    2014-06-14 → cancelled 2014-07-04
← Back to W0RTT License history →