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

AI4ML callsign genealogy

Currently held by Liu, Shen

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 AI4ML's current licensee, walking backwards.

  1. AI7GBcancelled· E
    Liu, ShenORgranted 2020-12-01cancelled 2021-04-03
  2. KN6MKDcancelled· E
    Liu, ShenORgranted 2020-12-01cancelled 2021-03-16

Successor callsigns

Callsigns held now by people who previously held AI4ML.

  1. KG4Sexpired· E
    HART, MICHAEL DSCgranted 2006-02-14cancelled 2018-02-15

All historical holders

Every license row we've seen with the callsign AI4ML, oldest first.

  • HART, MICHAEL D SC
    2005-06-07 → cancelled 2006-02-14
  • Liu, Shen OR
    2021-04-03 active
← Back to AI4ML License history →