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

K4JRF callsign genealogy

Currently held by HOWELL, ARTHUR 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 K4JRF's current licensee, walking backwards.

  1. WT6Mcancelled· E
    Moe, FrederickCAgranted 2026-01-27cancelled 2026-02-27
  2. WZ6FMcancelled· E
    Moe, FrederickCAgranted 2025-12-09cancelled 2026-01-27
  3. KZ6FLMcancelled· E
    Moe, FrederickCAgranted 2025-09-09cancelled 2025-12-09
  4. KO6KRCcancelled· G
    Moe, FrederickCAgranted 2025-08-21cancelled 2025-09-09

Successor callsigns

Callsigns held now by people who previously held K4JRF.

  1. NA4EJcancelled· E
    Folk, Effie JNCgranted 2021-10-05cancelled 2022-02-15

All historical holders

Every license row we've seen with the callsign K4JRF, oldest first.

  • HOWELL, ARTHUR S FL
    1988-07-05 → cancelled 2000-07-06
  • Frederick, John SC
    2006-10-11 → cancelled 2018-10-12
  • FOLK, JEFFREY R NC
    2018-11-24 → cancelled 2021-10-05
  • FULMER, JOHN R VA
    2024-01-06 active
← Back to K4JRF License history →