uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

N5MK callsign genealogy

Currently held by KONTAK, MARVIN D

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 N5MK's current licensee, walking backwards.

  1. N0MDHcancelled· E
    Heller, Michael DNJgranted 2020-04-07cancelled 2026-03-24
  2. KD2THAcancelled· G
    Heller, Michael DNJgranted 2020-01-15cancelled 2020-04-07

Successor callsigns

Callsigns held now by people who previously held N5MK.

  1. K5KONcancelled· E
    KONTAK, MARVIN DTXgranted 2003-02-19cancelled 2004-02-10

All historical holders

Every license row we've seen with the callsign N5MK, oldest first.

  • KONTAK, MARVIN D TX
    1997-11-19 → cancelled 2003-02-19
  • KONTAK, MARVIN D TX
    2013-12-19 → cancelled 2026-03-07
  • Heller, Michael D NJ
    2026-03-24 active
← Back to N5MK License history →