A list of all 3Ds Servers:
ccs.cdn.c.shop.nintendowifi.net - Used if you download a 3DsWare
example: ccs.cdn.c.shop.nintendowifi.net/ccs/download/0004000000070100/00000002

3Ds eShop Server:
nus.cdn.c.shop.nintendowifi.net
nus.c.shop.nintendowifi.net
ecs.c.shop.nintendowifi.net
cp3s-auth.c.shop.nintendowifi.net
cas.c.shop.nintendowifi.net
a248.e.akamai.net