ipset is a Go library for dealing with sets of CIDR prefixes. It uses a radix tree (r=2), also called a Patricia trie.
After creating an ipset.Set and populating it with prefixes, the Contains function
can be used to check if a given address is contained by any of the prefixes in the set.
import "github.com/kentik/ipset"
set := ipset.NewSetFromCSV("10.0.0.0/8,172.16.0.0/16,192.168.0.0/255")
contained := set.Contains(net.ParseIP("10.1.128.0"))
See LICENSE for license information.