sold.truo.co has no NS records.
NS records for this zone are defined at truo.co.
NS records for this zone are defined at truo.co.
Question and response
Question
dig sold.truo.co. NS
Answer
The response has no answer records.
Authority
truo.co. 1800 SOA randall.ns.cloudflare.com. dns.cloudflare.com. 2399062805 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0