foo-ns.foobar.fi has no CNAME records.
Question and response
Question
dig foo-ns.foobar.fi. NS
Answer
The response has no answer records.
Authority
foobar.fi. 3600 SOA foo-ns.foobar.fi. hostmaster.foobar.fi. 1771257506 28800 3600 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0