ns1.developingsolutions.org has no AAAA records.
Question and response
Question
dig ns1.developingsolutions.org. AAAA
Answer
ns1.developingsolutions.org. 5 CNAME developingsolutions.org.
Authority
developingsolutions.org. 3511 SOA dns.developingsolutions.org. hostmaster.developingsolutions.org. 1516062193 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0