Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9CAO callsign genealogy
Currently held by Cao, Lei
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 K9CAO's current licensee, walking backwards.
- Cao, LeiILgranted 2022-12-01cancelled 2023-01-07
Successor callsigns
Callsigns held now by people who previously held K9CAO.
No current licensee on record previously held this callsign.