mail.rackzar.net has no NS records.
NS records for this zone are defined at rackzar.net.
NS records for this zone are defined at rackzar.net.
Question and response
Question
dig mail.rackzar.net. NS
Answer
The response has no answer records.
Authority
rackzar.net. 1800 SOA adel.ns.cloudflare.com. dns.cloudflare.com. 2398430026 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0