sys.lead.im has no CNAME records.
Question and response
Question
dig sys.lead.im. NS
Answer
The response has no answer records.
Authority
lead.im. 3 SOA ns1.lead.im. hostmaster.lead.im. 2017070684 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0