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

K9FK callsign genealogy

Currently held by Maassen, John P

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 K9FK's current licensee, walking backwards.

  1. AB9CJcancelled· E
    Maassen, John PINgranted 2001-06-11cancelled 2002-04-30
  2. KB9ZVBcancelled· E
    Maassen, John PINgranted 2001-06-11cancelled 2001-06-19

Successor callsigns

Callsigns held now by people who previously held K9FK.

No current licensee on record previously held this callsign.

← Back to K9FK License history →