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Small utility program to perform multiple operations for a given subnet/CIDR ranges.

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mapCIDR

A utility program to perform multiple operations for a given subnet/cidr ranges.

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mapCIDR is developed to ease load distribution for mass scanning operations, it can be used both as a library and as independent CLI tool.

Features

mapCIDR

  • CIDR expansion support.
  • CIDR slicing support.
  • CIDR/IP aggregation support.
  • CIDR based IP filter support.
  • STD IN/OUT support.

Installation

▶ GO111MODULE=on go get -v github.com/projectdiscovery/mapcidr/cmd/mapcidr

Usage

▶ mapcidr -h

This will display help for the tool. Here are all the switches it supports.

Flag Description Example
aggregate Aggregate CIDRs into the minimum number mapcidr -aggregate
cidr Single CIDR to process mapcidr -cidr 173.0.84.0/24
ips File containing ips to process mapcidr -ips ips.txt
sbc Slice by CIDR count mapcidr -sbc 10
sbh Slice by HOST count mapcidr -sbh 10000
l File containing list of CIDRs mapcidr -l cidr.txt
o File to write output to (optional) mapcidr -o output.txt
silent Make the output silent mapcidr -silent
version Print current version of mapcidr client mapcidr -version
shuffle Shuffle ip with masscan blackrock cipher mapcidr -shuffle
shuffle-ports Shuffle ip:port with comma seprated list of ports mapcidr -shuffle -shuffle-ports 21,80,443

Running mapCIDR

In order to get list of IPs for a give CIDR, use the following command.

CIDR expansion

▶ mapcidr -cidr 173.0.84.0/24
                   ____________  ___    
  __ _  ___ ____  / ___/  _/ _ \/ _ \
 /  ' \/ _ '/ _ \/ /___/ // // / , _/   
/_/_/_/\_,_/ .__/\___/___/____/_/|_| v0.5
          /_/                                                     	 

		projectdiscovery.io

[WRN] Use with caution. You are responsible for your actions
[WRN] Developers assume no liability and are not responsible for any misuse or damage.

173.0.84.0
173.0.84.1
173.0.84.2
173.0.84.3
173.0.84.4
173.0.84.5
173.0.84.13
173.0.84.14
173.0.84.15
173.0.84.16

CIDR Slicing by CIDR

In order to slice given CIDR or list of CIDR by CIDR count or slice into multiple and equal smaller subnets, use the following command.

▶ mapcidr -cidr 173.0.84.0/24 -sbc 10 -silent
173.0.84.0/27
173.0.84.32/27
173.0.84.64/27
173.0.84.96/27
173.0.84.128/27
173.0.84.160/27
173.0.84.208/28
173.0.84.192/28
173.0.84.240/28
173.0.84.224/28

CIDR slicing by HOST

In order to slice given CIDR for equal number of host count in each CIDR, use the following command.

▶ mapcidr -cidr 173.0.84.0/16 -sbh 20000 -silent
173.0.0.0/18
173.0.64.0/18
173.0.128.0/18
173.0.192.0/18

Note: it's possible to obtain a perfect split only when the desired amount of slices or hosts per subnet is a powers of two. Otherwise the tool will attempt to automatically find the best split strategy to obtain the desired outcome.

CIDR/IP aggregation

In order to merge multiple CIDR ranges into smaller subnet block, use the following command.

▶ mapcidr -l cidrs.txt -silent -aggregate

In order to list CIDR blocks for given list of IP's, use the following command.

▶ mapcidr -l ips.txt -silent -aggregate

CIDR based IP filtering

In order to filter IP's from the given list of CIDR ranges, use the following command.

▶ mapcidr -ips ip-list.txt -l cirds.txt

Use mapCIDR as a library

It's possible to use the library directly in your go programs. The following code snippets outline how to divide a cidr into subnets, and how to divide the same into subnets containing a certain number of hosts

package main

import (
	"fmt"

	"github.com/projectdiscovery/mapcidr"
)

func main() {
	// Divide the CIDR into two subnets
	subnets1 := mapcidr.SplitN("192.168.1.0/24", 2)
	for _, subnet := range subnets1 {
		fmt.Println(subnet)
	}
	// Divide the CIDR into two subnets containing 128 hosts each
	subnets2 := mapcidr.SplitByNumber("192.168.1.0/24", 128)
	for _, subnet := range subnets2 {
		fmt.Println(subnet)
	}

	// List all ips in the CIDR
	ips, _ := mapcidr.IPAddresses("192.168.1.0/24")
	for _, ip := range ips {
		fmt.Println(ip)
	}
}

mapCDIR is made with 🖤 by the projectdiscovery team.

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Small utility program to perform multiple operations for a given subnet/CIDR ranges.

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