ipx

Extending IP address support for Go.

func ExampleCollapse() {
	fmt.Println(ipx.Collapse(
		[]*net.IPNet{
			cidr("192.0.2.0/26"),
			cidr("192.0.2.64/26"),
			cidr("192.0.2.128/26"),
			cidr("192.0.2.192/26"),
		},
	))
	// Output:
	// [192.0.2.0/24]
}

func ExampleSplit() {
	c := cidr("10.0.0.0/24")
	splitter := ipx.Split(c, 26)
	for splitter.Next() {
		fmt.Println(splitter.Net())
	}
	// Output:
	// 10.0.0.0/26
	// 10.0.0.64/26
	// 10.0.0.128/26
	// 10.0.0.192/26
}

func ExampleSummarizeRange() {
	fmt.Println(ipx.SummarizeRange(net.ParseIP("192.0.2.0"), net.ParseIP("192.0.2.130")))
	// Output:
	// [192.0.2.0/25 192.0.2.128/31 192.0.2.130/32]
}

func ExampleExclude() {
	fmt.Println(
		ipx.Exclude(
			cidr("10.1.1.0/24"),
			cidr("10.1.1.0/26"),
		),
	)
	// Output:
	// [10.1.1.128/25 10.1.1.64/26]
}

See example tests for more usage.

design thoughts

• Coordinate on stdlib types
• Avoid allocations whenever possible.
• Look to python ipaddress lib for feature list