frodo.nask.waw.pl has no CNAME records.
Question and response
Question
dig frodo.nask.waw.pl. NS
Answer
The response has no answer records.
Authority
nask.waw.pl. 2550 SOA ns.nask.org.pl. dns.nask.pl. 2026030200 28800 3600 604800 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0