update.bibliopolis.info has no CNAME records.
Question and response
Question
dig update.bibliopolis.info. NS
Answer
The response has no answer records.
Authority
bibliopolis.info. 275 SOA x.ns.joker.com. hostmaster.joker.com. 2026020653 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0