CDNs

Main part of URL (interchangeable):
http://["nus"(used for system stuff?)/"ccs"(used for games etc?)].cdn["."(only works if next one is set to "wii.com")/".t"/".c"/".wup"].shop.["wii.com"/"nintendo.net"/"nintendowifi.net"]/ccs/download/

Combinations used by...:
nustool - http://ccs.cdn.c.shop.nintendowifi.net/
JNUSTool - http://ccs.cdn.wup.shop.nintendo.net/ccs/download/

then:
[title id]

then one of these:
tmd[.title version]
cetk
Content ID (8 digit hex number)

eShop Metadata

https://samurai.[ctr or wup].shop.nintendo.net/samurai/ws/<two-letter region code>/["titles" or "title/[eshop id]"]?limit=[limit]&offset=[offset]