netblocks.aserv.co.za has no CNAME records.
Question and response
Question
dig netblocks.aserv.co.za. NS
Answer
The response has no answer records.
Authority
aserv.co.za. 1800 SOA ns.dns1.co.za. abuse.aserv.co.za. 2025102901 28800 3600 2419200 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0