I have a 5.4.0 Wii u and a Linksys EA6100 router and the closest thing to blocking URLs is going in the parental controls on my router, selecting the wii u device, then I add these URL's to the list to block (from the definitive guide):
- nus.c.shop.nintendowifi.net
- nus.cdn.c.shop.nintendowifi.net
- nus.cdn.shop.wii.com
- nus.cdn.wup.shop.nintendo.net
- nus.wup.shop.nintendo.net
- c.shop.nintendowifi.net
- cbvc.cdn.nintendo.net
- cbvc.nintendo.net
Last edited by mpkostek,