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

KF9N callsign genealogy

Currently held by KOSMAK, JOHN G

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 KF9N's current licensee, walking backwards.

  1. K9RQYcancelled· E
    Scanlon, Brian JILgranted 2006-04-21cancelled 2011-07-19
  2. W9BJScancelled· E
    STROTHER JR, BERNARD JAZgranted 2018-08-07cancelled 2021-05-28
  3. KD9ERAcancelled· E
    STROTHER JR, BERNARD JINgranted 2015-10-01cancelled 2018-08-07

Successor callsigns

Callsigns held now by people who previously held KF9N.

  1. WN4OAAcancelled· E
    KOSMAK, JOHN GTNgranted 1999-05-12cancelled 2007-07-31

All historical holders

Every license row we've seen with the callsign KF9N, oldest first.

  • Scanlon, Brian J IL
    2021-04-29 active
  • KOSMAK, JOHN G
    — → cancelled 1999-05-12
← Back to KF9N License history →