exchange.megawire.com has no NS records.
NS records for this zone are defined at megawire.com.
NS records for this zone are defined at megawire.com.
Question and response
Question
dig exchange.megawire.com. NS
Answer
The response has no answer records.
Authority
megawire.com. 1800 SOA jeremy.ns.cloudflare.com. dns.cloudflare.com. 2398746588 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0