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

KC8M callsign genealogy

Currently held by Hefferan, Michael J

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 KC8M's current licensee, walking backwards.

  1. KI8JFcancelled· E
    Hefferan, Michael JMIgranted 1997-08-15cancelled 2000-03-28
  2. KC8IJPcancelled· G
    HEFFERAN, MICHAEL JMIgranted 1997-08-15cancelled 1999-10-19

Successor callsigns

Callsigns held now by people who previously held KC8M.

  1. K4YZcancelled· E
    ROBESON, STEVEN JTNgranted 1996-12-04cancelled 2003-05-13
← Back to KC8M License history →