product.collophon.com has no NS records.
NS records for this zone are defined at collophon.com.
NS records for this zone are defined at collophon.com.
Question and response
Question
dig product.collophon.com. NS
Answer
The response has no answer records.
Authority
collophon.com. 3600 SOA dns.collophon.com. hostmaster.collophon.com. 1253801623 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0