Subneter

Library for IPv4 Subnetting

What does it do?

Given a cidr address, it calculates

Network Id
First usable IP
Last usable IP
Broadcast address

package main

import (
	"fmt"
	"github.com/milindacharya/subneter"
)

func main() {
	s, _ := subneter.CidrToSubneter("192.168.1.15/25")
	fmt.Printf("Network Address: %s\n", s.NetworkID)
	fmt.Printf("First Host: %s\n", s.FirstHost)
	fmt.Printf("Last Host: %s\n", s.LastHost)
	fmt.Printf("Broadcast Address: %s\n", s.BroadcastIP)
}

Output is

Network Address: 192.168.1.0
First Host: 192.168.1.1
Last Host: 192.168.1.126
Broadcast Address: 192.168.1.127

More to come... (work in progress)

Given a subnet
- return all possible subnets with same network mask
- divide it further into subnets to have x number of hosts per subnet
- divide it into y number of networks
- optimally divide it into x number of networks with y number of hosts if possible
IPv6 support