github.com/gaissmai/cidrtree (go): Package cidrtree provides fast IP to CIDR lookup (longest prefix match).  This package is a specialization of the more generic interval package of the same author, but explicit for CIDRs. It has a narrow focus with a smaller and simpler API.
Keywords: cidr|ip|ipv4|ipv6|longest-common-prefix|longest-prefix-match|lookup-ip|software-router|treap