uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

AI4SY callsign genealogy

Currently held by PALMER JR, WILLIAM 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 AI4SY's current licensee, walking backwards.

  1. AA4BPactive· E
    Powers, William BCAgranted 2024-07-17
  2. KK4WZNcancelled· E
    Powers, William BTNgranted 2014-02-07cancelled 2014-05-09

Successor callsigns

Callsigns held now by people who previously held AI4SY.

  1. AA4BPcancelled· E
    PALMER JR, WILLIAM JALgranted 2008-02-01cancelled 2009-05-27

All historical holders

Every license row we've seen with the callsign AI4SY, oldest first.

  • PALMER JR, WILLIAM J AL
    2004-05-08 → cancelled 2008-02-01
  • PALMER JR, WILLIAM J AL
    2019-04-02 active
← Back to AI4SY License history →