Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AJ7DU callsign genealogy
Currently held by Teo, Zheng Wen
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 AJ7DU's current licensee, walking backwards.
- Teo, Zheng WenORgranted 2025-03-15cancelled 2025-04-10
Successor callsigns
Callsigns held now by people who previously held AJ7DU.
No current licensee on record previously held this callsign.