Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K2COS callsign genealogy
Currently held by Xu, Keshuai
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 K2COS's current licensee, walking backwards.
- Xu, KeshuaiMAgranted 2016-03-10cancelled 2016-04-16
Successor callsigns
Callsigns held now by people who previously held K2COS.
No current licensee on record previously held this callsign.