mux14.bay.osdinfra.net has no NS records.
NS records for this zone are defined at osdinfra.net.
NS records for this zone are defined at osdinfra.net.
Question and response
Question
dig mux14.bay.osdinfra.net. NS
Answer
The response has no answer records.
Authority
osdinfra.net. 300 SOA ns1-32.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0