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

AC4US callsign genealogy

Currently held by Tepperman, Barry S

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 AC4US's current licensee, walking backwards.

  1. W3LDactive· E
    NEMIA II, FRANK APAgranted 2020-07-25
  2. AK3HDcancelled· E
    NEMIA II, FRANK APAgranted 2020-07-07cancelled 2020-07-25
  3. KC3PFQcancelled· E
    NEMIA II, FRANK APAgranted 2020-05-15cancelled 2020-07-07

Successor callsigns

Callsigns held now by people who previously held AC4US.

  1. N3KWcancelled· E
    WILLIAMSON JR, O GORDONFLgranted 2019-02-05cancelled 2019-10-11

All historical holders

Every license row we've seen with the callsign AC4US, oldest first.

  • Tepperman, Barry S PA
    2002-06-03 → cancelled 2014-08-26
  • WILLIAMSON JR, O GORDON FL
    2018-07-06 → cancelled 2019-02-05
← Back to AC4US License history →