Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ASU callsign genealogy
Currently held by Heinrich, Justin E
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 K4ASU's current licensee, walking backwards.
- Heinrich, Justin EIAgranted 2004-01-06cancelled 2004-08-03
Successor callsigns
Callsigns held now by people who previously held K4ASU.
No current licensee on record previously held this callsign.