ns1.discountdevelop.com has no AAAA records.
Question and response
Question
dig ns1.discountdevelop.com. AAAA
Answer
ns1.discountdevelop.com. 1 CNAME discountdevelop.com.
Authority
discountdevelop.com. 3591 SOA dns.discountdevelop.com. hostmaster.discountdevelop.com. 1260274494 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0