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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

K4AO callsign genealogy

Currently held by MURPHY, ROBERT B

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 K4AO's current licensee, walking backwards.

  1. WA4HKXcancelled· E
    JOHNSON JR, MACK CGAgranted 2018-12-14cancelled 2020-11-10
  2. N4SSactive
    Radio Ridge Contect ClubKYgranted 2021-01-05
  3. KT4RRcancelled
    Radio Ridge Contect ClubKYgranted 2013-01-18cancelled 2021-01-05
  4. KK4NFAcancelled
    Radio Ridge Contect ClubKYgranted 2012-12-10cancelled 2013-01-18

Successor callsigns

Callsigns held now by people who previously held K4AO.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign K4AO, oldest first.

  • MURPHY, ROBERT B FL
    1987-11-03 → cancelled 1989-08-07
  • SIMONTON, RONALD H KY
    1999-11-03 → cancelled 2006-10-02
  • CARMICHAEL, JOHN R TN
    2008-10-21 → cancelled 2020-10-22
  • JOHNSON JR, MACK C GA
    2020-11-10 active
← Back to K4AO License history →