a2.ns.ix.ru has no CNAME records.
Question and response
Question
dig a2.ns.ix.ru. NS
Answer
The response has no answer records.
Authority
ix.ru. 62 SOA ns.msk-ix.ru. noc-dns.msk-ix.ru. 650146741 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0