ts-sib.itcom.info has no CNAME records.
Question and response
Question
dig ts-sib.itcom.info. NS
Answer
The response has no answer records.
Authority
itcom.info. 1453 SOA isp.24hc.ru. info.itcom.info. 2017052294 3600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0