v5114.v5e94de3c.use4.send.mailgun.net has no NS records.
NS records for this zone are defined at v5e94de3c.use4.send.mailgun.net.
NS records for this zone are defined at v5e94de3c.use4.send.mailgun.net.
Question and response
Question
dig v5114.v5e94de3c.use4.send.mailgun.net. NS
Answer
The response has no answer records.
Authority
v5e94de3c.use4.send.mailgun.net. 300 SOA ns-cloud-a1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0