default-185-145-153-151.interdsl.co.uk has no CNAME records.
Question and response
Question
dig default-185-145-153-151.interdsl.co.uk. NS
Answer
The response has no answer records.
Authority
interdsl.co.uk. 1060 SOA ns1.interdns.co.uk. hostmaster.interdns.co.uk. 1752693663 3600 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0