I assume you mean the DNS Servers being
Primary : 168.235.092.108
Secondary : 081.004.127.020
If so, then yeah those servers seem to be down as they're unresolved address(es) currently. This can happen from any number of reasons due to either the hoster not wanting to bother keeping the server up anymore, or depending on the method of hosting not wanting to
pay for it any more. They could also just be having hosting issues, so don't immediately get angry about it.
if you're dead-set on a DNS method for blocking updates, then you can quite literally make a custom DNS Registry that blocks the following URLs
- nus.cdn.c.shop.nintendowifi.net
- nus.cdn.shop.wii.com
- nus.cdn.wup.shop.nintendo.net
- nus.wup.shop.nintendo.net
- nus.c.shop.nintendowifi.net
- c.shop.nintendowifi.net
- cbvc.nintendo.net
- cbvc.cdn.nintendo.net
Alternatively, you can also just block the URLs directly on your router.
Or you can do as
@godreborn stated and simply delete the update folder, which removes the need for needing to use a different DNS or changing network settings entirely. Not to mention it also leaves less variability as a DNS server can go out at any time, while if the system update folder literally doesn't exist, then it can't update. It's also completely reversible, and iirc there's a homebrew application that does it
for you.
So it's not like you don't have options.