iptocc 1.3.3

Fast, offline IPv4/IPv6 address to ISO-3166 country code lookup using RIR delegated statistics
Documentation 
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pub const FIRST_LEVEL_COUNT: usize = 65537;
pub const V6_BUCKET_COUNT: usize = 65536;
pub const V6_SUB_INDEX_LEN: usize = 257;
pub const V4_GAP_SENTINEL: [u8; 2] = [0xFF, 0xFF];
pub const V6_BUCKET_EMPTY: u8 = 0xFF;