www.astro4dev.org has no CNAME records.
Question and response
Question
dig www.astro4dev.org. NS
Answer
The response has no answer records.
Authority
astro4dev.org. 1855 SOA NS15.WORLDNIC.COM. namehost.WORLDNIC.COM. 126012307 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0