arbor2.gblnet.RU has no CNAME records.
Question and response
Question
dig arbor2.gblnet.RU. NS
Answer
The response has no answer records.
Authority
gBLNET.ru. 7266 SOA ns.gBLNET.ru. vvv.gBLNET.ru. 2026030201 10800 1200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0