deny.smartspb.net has no CNAME records.
Question and response
Question
dig deny.smartspb.net. NS
Answer
The response has no answer records.
Authority
smartspb.net. 552 SOA ns4.smartspb.net. hostmaster.smartspb.net. 930 28800 1800 1209600 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0