cron-1.opensrs.net has no CNAME records.
Question and response
Question
dig cron-1.opensrs.net. NS
Answer
The response has no answer records.
Authority
opensrs.net. 60 SOA ns1.tucows.com. hostmaster.opensrs.net. 2026012101 1200 3600 2592000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0