proxy.pldt.net has no NS records.
NS records for this zone are defined at pldt.net.
NS records for this zone are defined at pldt.net.
Question and response
Question
dig proxy.pldt.net. NS
Answer
The response has no answer records.
Authority
pldt.net. 86400 SOA ns1.pldt.net. root.ns1.pldt.net. 2014113592 3600 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0