Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AJ4YI callsign genealogy
Currently held by HARTONG, MARK W
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 AJ4YI's current licensee, walking backwards.
- HARTONG, MARK WVAgranted 2010-02-16cancelled 2010-04-14
Successor callsigns
Callsigns held now by people who previously held AJ4YI.
No current licensee on record previously held this callsign.