mr1.nd.KOLO.NET has no CNAME records.
Question and response
Question
dig mr1.nd.KOLO.NET. NS
Answer
The response has no answer records.
Authority
kolo.net. 74 SOA ns.kolo.net. hostmaster.kolo.net. 2025120801 5400 900 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0