o2.ptr691.neogrid.com has no NS records.
NS records for this zone are defined at neogrid.com.
NS records for this zone are defined at neogrid.com.
Question and response
Question
dig o2.ptr691.neogrid.com. NS
Answer
The response has no answer records.
Authority
neogrid.com. 300 SOA ns1-09.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0