算是宣示性質的新聞稿吧，畢竟官網與 blog 以及 API 都還是沒 AAAA record：「Adding IPv6 connectivity support to the Dropbox desktop client」。
文章裡面提到支援 IPv6 only network，應該是指 ISP 有支援 NAT64 轉換的情況下可以使用 Dropbox 資源，而不是 Dropbox 整個 IPv6 ready...
gslin@home [~] [17:49/W4] dig www.dropbox.com aaaa @8.8.8.8 ; <<>> DiG 9.9.5-3ubuntu0.14-Ubuntu <<>> www.dropbox.com aaaa @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63706 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;www.dropbox.com. IN AAAA ;; ANSWER SECTION: www.dropbox.com. 55 IN CNAME www.dropbox-dns.com. ;; AUTHORITY SECTION: dropbox-dns.com. 1794 IN SOA dns1.p06.nsone.net. hostmaster.nsone.net. 1493415466 43200 7200 1209600 60 ;; Query time: 18 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Sat Apr 29 17:49:10 CST 2017 ;; MSG SIZE rcvd: 139