milindacharya / subneter

A library to query and manipulate subnets for ipv4 and ipv6

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