nsb.ns.il has no CNAME records.
Question and response
Question
dig nsb.ns.il. NS
Answer
The response has no answer records.
Authority
il. 1771 SOA nsa.ns.il. hostmaster.isoc.org.il. 2026030500 3600 1800 5184000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0