mailcluster.zen.co.uk has no NS records.
NS records for this zone are defined at zen.co.uk.
NS records for this zone are defined at zen.co.uk.
Question and response
Question
dig mailcluster.zen.co.uk. NS
Answer
The response has no answer records.
Authority
zen.co.uk. 86400 SOA ns0.zen.co.uk. dnsmaster.zen.co.uk. 2026022006 2400 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0