mail.advancedserverdns.com has no NS records.
NS records for this zone are defined at advancedserverdns.com.
NS records for this zone are defined at advancedserverdns.com.
Question and response
Question
dig mail.advancedserverdns.com. NS
Answer
The response has no answer records.
Authority
advancedserverdns.com. 1800 SOA gabe.ns.cloudflare.com. dns.cloudflare.com. 2398144655 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0