ns4.211.ru has no CNAME records.
Question and response
Question
dig ns4.211.ru. NS
Answer
The response has no answer records.
Authority
211.ru. 60 SOA ns.211.ru. postmaster.sibset-team.ru. 2026012704 900 900 2592000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0