dbc.greencells.net has no NS records.
NS records for this zone are defined at greencells.net.
NS records for this zone are defined at greencells.net.
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 1220, xrcode 0, version 0, flags 0