zim.sleepysquirrel.com has no CNAME records.
Question and response
Question
dig zim.sleepysquirrel.com. NS
Answer
The response has no answer records.
Authority
sleepysquirrel.com. 2617 SOA ns1.sleepysquirrel.com. root.sleepysquirrel.com. 2025060884 1200 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0