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

KA0YFS callsign genealogy

Currently held by Ulmer, Eric R

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 KA0YFS's current licensee, walking backwards.

  1. K0RNSactive· T
    nalder II, Nathan JCOgranted 2018-05-05
  2. KE0REScancelled· T
    nalder II, Nathan JCOgranted 2018-04-16cancelled 2018-05-05

Successor callsigns

Callsigns held now by people who previously held KA0YFS.

  1. K0RNScancelled· G
    Ulmer, Eric RMNgranted 2003-08-07cancelled 2010-03-26

All historical holders

Every license row we've seen with the callsign KA0YFS, oldest first.

  • Ulmer, Eric R MN
    1998-05-04 → cancelled 2003-08-07
  • Ulmer, Eric R NY
    2020-06-23 active
← Back to KA0YFS License history →