mx1.airtel.lk has no NS records.
NS records for this zone are defined at airtel.lk.
NS records for this zone are defined at airtel.lk.
Question and response
Question
dig mx1.airtel.lk. NS
Answer
The response has no answer records.
Authority
airtel.lk. 300 SOA ns1-07.azure-dns.com. azuredns-hostmaster.microsoft.com. 3 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0