ns2.blackinfonet.com has no CNAME records.
Question and response
Question
dig ns2.blackinfonet.com. NS
Answer
The response has no answer records.
Authority
blackinfonet.com. 3292 SOA ns1.blackinfonet.com. postmaster.blackinfonet.com. 2025081214 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0