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

KP4IC callsign genealogy

Currently held by MARRERO, MICHAEL 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 KP4IC's current licensee, walking backwards.

  1. KP3CIcancelled· E
    MONTALVO, EDGARDO JPRgranted 2014-04-28cancelled 2016-06-01
  2. WP4OZMcancelled· E
    MONTALVO, EDGARDO JPRgranted 2014-04-28cancelled 2014-09-30

Successor callsigns

Callsigns held now by people who previously held KP4IC.

  1. KP4DDactive· E
    MONTALVO, EDGARDO JPRgranted 2021-12-14

All historical holders

Every license row we've seen with the callsign KP4IC, oldest first.

  • MARRERO, MICHAEL A PR
    1994-09-14 → cancelled 2006-09-15
  • MONTALVO, EDGARDO J PR
    2016-06-01 → cancelled 2021-12-14
← Back to KP4IC License history →