dns.trewerne.com has no NS records.
NS records for this zone are defined at trewerne.com.
NS records for this zone are defined at trewerne.com.
Question and response
Question
dig dns.trewerne.com. NS
Answer
The response has no answer records.
Authority
trewerne.com. 3600 SOA dns.trewerne.com. hostmaster.trewerne.com. 1794518037 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0