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

K4FPM callsign genealogy

Currently held by Frederick, Jason A

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 K4FPM's current licensee, walking backwards.

  1. KK4WBHcancelled· G
    Frederick, Jason AFLgranted 2012-05-17cancelled 2014-01-14
  2. KK4JJEcancelled· G
    Frederick, Jason AFLgranted 2012-05-17cancelled 2013-12-23

Successor callsigns

Callsigns held now by people who previously held K4FPM.

No current licensee on record previously held this callsign.

← Back to K4FPM License history →