s520.v2nets.com has no CNAME records.
Question and response
Question
dig s520.v2nets.com. NS
Answer
The response has no answer records.
Authority
v2nets.com. 1526 SOA rick.ns.cloudflare.com. dns.cloudflare.com. 2395999162 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0