dbc.greencells.net has no CNAME records.
Question and response
Question
dig dbc.greencells.net. NS
Answer
The response has no answer records.
Authority
greencells.net. 300 SOA ns1051.ui-dns.biz. hostmaster.1and1.com. 2018070498 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0