cidr

CIDR (Classless inter-domain routing)

This Package converts IP CIDR to range and return First IP, Last IP, First IP decimal, Last IP decimal and Total Host count for IPv4 and IPv6

Install

go get -u github.com/m7shapan/cidr

How to use

See the GoDoc

package main

import (
	"fmt"
	"log"

	"github.com/m7shapan/cidr"
)

func main() {
	p, err := cidr.ParseCIDR("1.0.0.0/24")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("First IP:", p.FirstIP)
	if p.IsIPv4 {
		fmt.Println("First IP (Decimal):", p.FirstIPv4())
	} else {
		fmt.Println("First IP (Decimal):", p.FirstIPv6())
	}

	fmt.Println("Last IP:", p.LastIP)

	if p.IsIPv4 {
		fmt.Println("Last IP (Decimal):", p.LastIPv4())
	} else {
		fmt.Println("Last IP (Decimal):", p.LastIPv6())
	}

	if p.IsIPv4 {
		fmt.Println("Total Host:", p.HostCountIPv4())
	} else {
		fmt.Println("Total Host:", p.HostCountIPv6())
	}

	// First IP: 1.0.0.0
	// First IP (Decimal): 16777216
	// Last IP: 1.0.0.255
	// Last IP (Decimal): 16777471
	// Total Host: 256


	ip := net.ParseIP("1.0.0.0")
	fmt.Println(IPv4tod(ip)) // 16777216

	ip := net.ParseIP("2001:4860:4860::8888")
	fmt.Println(IPv6tod(ip)) // 42541956123769884636017138956568135816

	var i uint32 = 16777216
	fmt.Println(DtoIPv4(i)) // 1.0.0.0

	b := new(big.Int)
	b.SetString("42541956123769884636017138956568135816", 10)
	fmt.Println(DtoIPv6(b)) // 2001:4860:4860::8888

}

Package usage for SEO

• get ip from ip range
• convert ip range to ip
• golang convert ip range to decimal
• How to get first/last IP address of CIDR
• Convert IP version 6 address to integer or decimal number
• IPv4 to IP Decimal Conversion
• ipv4 to decimal golang