pbx.bluerhinos.co.uk has no NS records.
NS records for this zone are defined at bluerhinos.co.uk.
NS records for this zone are defined at bluerhinos.co.uk.
Question and response
Question
dig pbx.bluerhinos.co.uk. NS
Answer
The response has no answer records.
Authority
bluerhinos.co.uk. 1800 SOA derek.ns.cloudflare.com. dns.cloudflare.com. 2400058942 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0