Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AA1HY callsign genealogy
Currently held by Yu, Heindrick
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 AA1HY's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AA1HY.
- HOSA JR, ADAM ECTgranted 2002-04-04cancelled 2009-12-15
All historical holders
Every license row we've seen with the callsign AA1HY, oldest first.
- HOSA JR, ADAM E CT1993-11-16 → cancelled 2002-04-04
- Yu, Heindrick CA2026-02-10 active