ipnets

Package ipnets divides net.IPNet networks into subnets.

Originally forked from mhuisi/ipv4utils, but now repurposed.

Install

go get github.com/dghubble/ipnets

Docs

Read GoDoc

Usage

Divide a net.IPNet by shifting the subnet bitmask with SubnetShift.

import (
    "net"
    "github.com/dghubble/ipnets"
)
...

ip, network, err := net.ParseCIDR("10.2.0.0/16")
subnets, err := ipnets.SubnetShift(network, 1)

fmt.Println(subnets)     // [10.2.0.0/17 10.2.128.0/17]

Divide a net.IPNet into a desired number of subnets (or more) with SubnetInto. If a number is given that is not a power of 2, the returned number of subnets will be the next power of 2.

ip, network, err := net.ParseCIDR("10.2.0.0/16")
subnets, err := ipnets.SubnetInto(network, 4)

fmt.Println(subnets)     // [10.2.0.0/18 10.2.64.0/18 10.2.128.0/18 10.2.192.0/18]

Contributing

Bug fixes are welcome. Please note that we are not accepting feature requests at this time.