mapCIDR | Small Utility Program To Perform Multiple Operations For A Given subnet/CIDR Ranges

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

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

Features

  • Simple and modular code base making it easy to contribute.
  • CIDR distribution for distributed scanning.
  • Stdin and stdout support for integrating in workflows

Installation:-

From Source

 GO111MODULE=auto go get -u github.com/projectdiscovery/mapcidr/cmd/mapcidr

From Github

 git clone https://github.com/projectdiscovery/mapcidr.git; cd mapcidr/cmd/mapcidr; go build .; cp mapcidr /usr/local/bin

Usage:-

 mapcidr -h

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

Flag Description Example
-cidr Single CIDR to process mapcidr -cidr 173.0.84.0/24
-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 chaos client mapcidr -version

Running mapCIDR

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

 mapcidr -cidr 173.0.84.0/24 echo 173.0.84.0/24 | mapcidr
                   ____________  ___      __ _  ___ ____  / ___/  _/ _ / _  /  ' / _ '/ _ / /___/ // // / , _/   /_/_/_/_,_/ .__/___/___/____/_/|_| v0.1          /_/                                                     	 		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.173.0.84.0173.0.84.1173.0.84.2173.0.84.3173.0.84.4173.0.84.5173.0.84.13173.0.84.14173.0.84.15173.0.84.16

Slice 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 echo 173.0.84.0/24 | mapcidr -sbc 10 -silent
173.0.84.0/27173.0.84.32/27173.0.84.64/27173.0.84.96/27173.0.84.128/27173.0.84.160/27173.0.84.208/28173.0.84.192/28173.0.84.240/28173.0.84.224/28

Slice 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 echo 173.0.84.0/16 | mapcidr -sbh 20000 -silent
173.0.0.0/18173.0.64.0/18173.0.128.0/18173.0.192.0/18

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.

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 mainimport (	"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.Ips("192.168.1.0/24")	for _, ip := range ips {		fmt.Println(ip)	}}

mapCDIR is made with  by the projectdiscovery team.

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