func main() {
aggregate := subnetmath.ParseNetworkCIDR("192.168.0.0/22")
subnets := []*net.IPNet{
subnetmath.ParseNetworkCIDR("192.168.1.0/24"),
subnetmath.ParseNetworkCIDR("192.168.2.32/30"),
}
unused := subnetmath.FindUnusedSubnets(aggregate, subnets)
// [ 192.168.0.0/24 192.168.2.0/27 192.168.2.36/30 192.168.2.40/29 192.168.2.48/28 192.168.2.64/26 192.168.2.128/25 192.168.3.0/24 ]
}Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
BenchmarkIntToAddr-8 30000000 56.1 ns/op 24 B/op 2 allocs/op
BenchmarkAddrToInt-8 20000000 80.5 ns/op 80 B/op 2 allocs/op
BenchmarkParseNetworkCIDR-8 10000000 167 ns/op 72 B/op 4 allocs/op
BenchmarkNetworkComesBefore-8 50000000 30.0 ns/op 0 B/op 0 allocs/op
BenchmarkIPv4ClassfulNetwork-8 20000000 89.1 ns/op 68 B/op 3 allocs/op
BenchmarkNextAddr-8 10000000 165 ns/op 104 B/op 4 allocs/op
BenchmarkShrinkNetwork-8 2000000 747 ns/op 104 B/op 26 allocs/op
BenchmarkNextNetwork-8 5000000 351 ns/op 256 B/op 9 allocs/op
BenchmarkFindInbetweenSubnets-8 200000 7118 ns/op 4336 B/op 133 allocs/op
BenchmarkFindInbetweenSubnetsBuffered-8 300000 4255 ns/op 168 B/op 9 allocs/op
BenchmarkFindUnusedSubnets-8 50000 31529 ns/op 6720 B/op 480 allocs/op