no-reverse-dns.metronet-uk.com has no CNAME records.
Question and response
Question
dig no-reverse-dns.metronet-uk.com. NS
Answer
The response has no answer records.
Authority
metronet-uk.com. 2386 SOA a.ns.ns247.net. hostmaster.metronet-uk.com. 2025052200 16384 2048 1048576 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0