docker.xgs.systems has no NS records.
NS records for this zone are defined at xgs.systems.
NS records for this zone are defined at xgs.systems.
Question and response
Question
dig docker.xgs.systems. NS
Answer
The response has no answer records.
Authority
xgs.systems. 1800 SOA mariah.ns.cloudflare.com. dns.cloudflare.com. 2399240489 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0