mm1.silknet.com has no CNAME records.
Question and response
Question
dig mm1.silknet.com. NS
Answer
The response has no answer records.
Authority
silknet.com. 10800 SOA main.wanex.net. hostmaster.wanex.net. 2026022601 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0