us.sysdop.com has no NS records.
NS records for this zone are defined at sysdop.com.
NS records for this zone are defined at sysdop.com.
Question and response
Question
dig us.sysdop.com. NS
Answer
The response has no answer records.
Authority
sysdop.com. 1800 SOA aragorn.ns.cloudflare.com. dns.cloudflare.com. 2397631424 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0