IDBE is Nintendo's title icon database. Entries contain title icon, region, and name (in various languages). Similar to the SMDH. All game titles are on the server (excluding DSiWare?), including demos and updates.
%02X seems to always be 0x10 (?)
%016llX is the title id.
%d is an optional title version.
The icon database is encrypted with AES-128 CBC. All icons use the same IV and one of 4 possible keys (as specified by the key index in the header).
The IV/keys are likely hardcoded on the 3DS, but not sure where. They are also on the WiiU.
|0x0||0x1||? (usually zero)|
Icon data is uncompressed RGB565.
|0x30||0x4||Region lockout (u32 little endian)|
|0x50 + i * 0x200||0x200||Title struct where i = language index|
|0x2050||0x480||24x24 Icon data|
|0x24D0||0x1200||48x48 Icon data|