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

KM4P callsign genealogy

Currently held by SILVER, GLENN L

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 KM4P's current licensee, walking backwards.

  1. AE4EKcancelled· E
    SILVER, GLENN LFLgranted 2020-08-14cancelled 2022-07-02
  2. WU3Zactive· E
    Szypulski, Raymond JPAgranted 2022-09-07
  3. KC3SPNcancelled· E
    Szypulski, Raymond JPAgranted 2021-08-20cancelled 2022-09-07

Successor callsigns

Callsigns held now by people who previously held KM4P.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign KM4P, oldest first.

  • Herstam, William B FL
    2010-05-26 → cancelled 2022-06-14
  • SILVER, GLENN L FL
    2022-07-02 active
← Back to KM4P License history →