osiris.lip6.fr has no CNAME records.
Question and response
Question
dig osiris.lip6.fr. NS
Answer
The response has no answer records.
Authority
lip6.fr. 2549 SOA osiris.lip6.fr. hostmaster.lip6.fr. 2026030200 21600 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0