tuthost.copiny.com has no NS records.
NS records for this zone are defined at copiny.com.
NS records for this zone are defined at copiny.com.
Question and response
Question
dig tuthost.copiny.com. NS
Answer
The response has no answer records.
Authority
copiny.com. 1800 SOA guy.ns.cloudflare.com. dns.cloudflare.com. 2396507266 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0