spb.AT-HOME.RU has no CNAME records.
Question and response
Question
dig spb.AT-HOME.RU. NS
Answer
The response has no answer records.
Authority
AT-HOME.RU. 4635 SOA ns.gblnet.RU. noc.AT-HOME.RU. 2026035139 10800 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0