I've noticed over the last couple of weeks sites like imgur.com were really slow to load or would only partially load an image, and tonight Youtube took half a minute to start rendering! Because nothing critical didn't seem broken I put it down to a local issue at my end. However tonight I thought I'd jump on DX.com and found that the website was only partially loading. I flushed the dns cache on my PC, tried different browsers and confirm the site was displaying correctly via a vodafone connection. Looking at the code I noticed images (and possibly other css stuff) weren't loading from a certain url - "img.dxcdn.com"

So I tried the following:

C:\Users\Computer>ping img.dxcdn.com
Ping request could not find host img.dxcdn.com. Please check the name and try again.

C:\Users\Computer>nslookup
Default Server:  ns1.xtra.co.nz
Address:  122.56.237.1

> img.dxcdn.com
Server:  ns1.xtra.co.nz
Address:  122.56.237.1

*** ns1.xtra.co.nz can't find img.dxcdn.com: Non-existent domain
>
>
> server 8.8.8.8
Default Server:  google-public-dns-a.google.com
Address:  8.8.8.8

> img.dxcdn.com
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Non-authoritative answer:
Name:    img.dxcdn.com
Addresses:  104.16.22.14
          104.16.23.14

So Google can find it but ns1.xtra can't. Any suggestions short of moving DNS over to Google?

Quick edit: I changed DNS to 4.4.4.4 and 8.8.8.8 and reddit now flys. This isn't ideal however.