ool-603976a6.static.optonline.net has no NS records.
NS records for this zone are defined at static.optonline.net.
NS records for this zone are defined at static.optonline.net.
Question and response
Question
dig ool-603976a6.static.optonline.net. NS
Answer
The response has no answer records.
Authority
static.optonline.net. 900 SOA authns1.cv.net. hostmaster.cv.net. 2012100538 7200 600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0