mailcow.1in9.net has no NS records.
NS records for this zone are defined at 1in9.net.
NS records for this zone are defined at 1in9.net.
Question and response
Question
dig mailcow.1in9.net. NS
Answer
The response has no answer records.
Authority
1in9.net. 1800 SOA arnold.ns.cloudflare.com. dns.cloudflare.com. 2399212558 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0