EShop
The Nintendo 3DS eShop was added in the June 2011 Update for JP/EUR/USA.
From here you can download Virtual Console games, 3D Classics, DSiware software, view screenshots and 3D trailers for upcoming 3DS titles.
When connecting to the servers, eShop requests from these domains over HTTPS: nus.c.shop.nintendowifi.net, ecs.c.shop.nintendowifi.net, cp3s-auth.c.shop.nintendowifi.net, cas.c.shop.nintendowifi.net, and a248.e.akamai.net.