mail.alt255.net has no NS records.
NS records for this zone are defined at alt255.net.
NS records for this zone are defined at alt255.net.
Question and response
Question
dig mail.alt255.net. NS
Answer
The response has no answer records.
Authority
alt255.net. 1800 SOA gina.ns.cloudflare.com. dns.cloudflare.com. 2397930542 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0