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

AA9SO callsign genealogy

Currently held by PISARSKI, ROBERT

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 AA9SO's current licensee, walking backwards.

  1. KS9SCcancelled· E
    COLON, SORIANOILgranted 2014-09-16cancelled 2014-10-24
  2. WP4LKYcancelled· E
    COLON, SORIANOILgranted 2012-09-04cancelled 2014-09-16

Successor callsigns

Callsigns held now by people who previously held AA9SO.

  1. AB9SUexpired· E
    PISARSKI, ROBERTINgranted 2009-01-07cancelled 2021-03-06

All historical holders

Every license row we've seen with the callsign AA9SO, oldest first.

  • PISARSKI, ROBERT IN
    1999-03-03 → cancelled 2009-01-07
  • COLON, SORIANO IL
    2014-10-24 active
← Back to AA9SO License history →