smtp.xenosite.net has no NS records.
NS records for this zone are defined at xenosite.net.
NS records for this zone are defined at xenosite.net.
Question and response
Question
dig smtp.xenosite.net. NS
Answer
The response has no answer records.
Authority
xenosite.net. 1800 SOA liz.ns.cloudflare.com. dns.cloudflare.com. 2398994404 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0