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

K4YY callsign genealogy

Currently held by SWAIN, 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 K4YY's current licensee, walking backwards.

  1. K4EXPactive· T
    Montero, MarcialNCgranted 2022-07-09
  2. K4HWYcancelled· T
    Montero, MarcialNCgranted 2021-05-28cancelled 2022-07-09
  3. W4MXMcancelled· T
    Montero, MarcialNCgranted 2020-06-01cancelled 2021-05-28
  4. KO4DIMcancelled· T
    Montero, MarcialNCgranted 2020-05-11cancelled 2020-06-01

Successor callsigns

Callsigns held now by people who previously held K4YY.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign K4YY, oldest first.

  • STALDER, EDGAR A LA
    2006-08-08 → cancelled 2015-12-13
  • SWAIN, MICHAEL J FL
    2018-01-03 active
← Back to K4YY License history →