billing.hostgator.mx has no NS records.
NS records for this zone are defined at hostgator.mx.
NS records for this zone are defined at hostgator.mx.
Question and response
Question
dig billing.hostgator.mx. NS
Answer
The response has no answer records.
Authority
hostgator.mx. 1800 SOA jessica.ns.cloudflare.com. dns.cloudflare.com. 2395891355 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0