v5151.v57b3cc8b.euw1.send.eu.mailgun.net has no NS records.
NS records for this zone are defined at v57b3cc8b.euw1.send.eu.mailgun.net.
NS records for this zone are defined at v57b3cc8b.euw1.send.eu.mailgun.net.
Question and response
Question
dig v5151.v57b3cc8b.euw1.send.eu.mailgun.net. NS
Answer
The response has no answer records.
Authority
v57b3cc8b.euw1.send.eu.mailgun.net. 300 SOA ns-cloud-d1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0