As others have stated here IP address are issued by region rather than country. The assigning authorities are:
ARIN at
www.arin.net for the Americas
APNIC at
www.apnic.net for Asia-Pacific
RIPE at
www.ripe.net for Europe.
The address blocks they cover are thus
APNIC Address Blocks 61/8, 202/7, 210/7, 218/7 and 220/8
ARIN Address Blocks 24/8, 63/8, 64/6, 68/8, 199/8, 200/8, 204/6,208/7 and 216/8
RIPE Address Blocks 62/8, 80/7, 193/8, 194/7, 212/7 and 217/8
Addresses outside of these blocks were allocated generally prior to the registries being set-up.
These registris took over from IANA in 1997 and addresses assigned before this time cannot be assumed to fit in with this geographic model.