Created subserver, but mobile devices can't reach it

Here's something kinda weird.

I created beta.deannazandt.com using Virtualmin (4.07), and bringing it up on my laptop browser (OSX 10.9.4, Chrome), it works just fine.

However, when I try to open the URL on either my HTC One or my iPad, I get: "This webpage is not available." This happens whether or not I'm connected to my home wifi, or if I connect them to the cellular data network. I double-checked my hosts file on my laptop to make sure I hadn't done any funky redirects. Only contents are the default: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost

DNS is managed by Amazon's Route 53 service; there is a record there for this domain:

beta.deannazandt.com. CNAME 74.50.60.88

Edit: Also did a dig, returning correct results:

; <<>> DiG 9.8.3-P1 <<>> beta.deannazandt.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 11468 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION: ;beta.deannazandt.com. IN A

;; ANSWER SECTION: beta.deannazandt.com. 299 IN CNAME 74.50.60.88.

;; AUTHORITY SECTION: . 1799 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2014073001 1800 900 604800 86400

Any ideas?

cheers dz