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

AB4YZ callsign genealogy

Currently held by KERFOOT, JONATHAN 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 AB4YZ's current licensee, walking backwards.

  1. K4ISPcancelled· E
    KERFOOT, JONATHAN LOKgranted 2017-04-19cancelled 2024-03-19
  2. KG4ZVTcancelled· E
    KERFOOT, JONATHAN LOKgranted 2003-04-23cancelled 2007-05-11

Successor callsigns

Callsigns held now by people who previously held AB4YZ.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign AB4YZ, oldest first.

  • CRAMPTON, RAYMOND W VA
    2010-08-12 → cancelled 2022-09-20
  • KERFOOT, JONATHAN L OK
    2024-03-19 active
← Back to AB4YZ License history →