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

Features • Install • Usage • Library • Join Discord

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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

• CIDR expansion support (default)
• CIDR slicing support (sbh, sbc)
• CIDR/IP aggregation support (a, aa)
• CIDR based IP filter support (cidr, ip)
• CIDR/IP sorting support (s, sr)
• CIDR host count support (c)
• IP/PORT shuffling support (si, sp)
• IPv4/IPv6 Conversation support (t4, t6)
• IPv4/IPv6 Filter support (f4, f6)
• CIDR STD IN/OUT support

Installation

go install -v github.com/projectdiscovery/mapcidr/cmd/mapcidr@latest

Usage

mapcidr -h

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

INPUT:
   -cl, -cidr string[]  CIDR/File containing list of CIDRs to process
   -il, -ip string[]    IP/File containing list of IPs to process

PROCESS:
   -sbc int                Slice CIDRs by given CIDR count
   -sbh int                Slice CIDRs by given HOST count
   -a, -aggregate          Aggregate IPs/CIDRs into minimum subnet
   -aa, -aggregate-approx  Aggregate sparse IPs/CIDRs into minimum approximated subnet
   -c, -count              Count number of IPs in given CIDR
   -t4, -to-ipv4           Convert IPs to IPv4 format
   -t6, -to-ipv6           Convert IPs to IPv6 format

FILTER:
   -f4, -filter-ipv4  Filter IPv4 IPs from input
   -f6, -filter-ipv6  Filter IPv6 IPs from input
   -skip-base         Skip base IPs (ending in .0) in output
   -skip-broadcast    Skip broadcast IPs (ending in .255) in output

MISCELLANEOUS:
   -s, -sort                  Sort input IPs/CIDRs in ascending order
   -sr, -sort-reverse         Sort input IPs/CIDRs in descending order
   -si, -shuffle-ip           Shuffle Input IPs in random order
   -sp, -shuffle-port string  Shuffle Input IP:Port in random order

OUTPUT:
   -verbose            Verbose mode
   -o, -output string  File to write output to
   -silent             Silent mode
   -version            Show version of the project

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 Count

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 Count

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 -cl cidrs.txt -aggregate

In order to list CIDR blocks for given list of IPs, use the following command.

$ mapcidr -il ips.txt -aggregate

It's also possible to perform approximated aggregations for sparse ips groups (only version 4). The final interval will contain contiguous ips not belonging to the input:

$ cat ips.txt 

1.1.1.1
1.1.1.16
1.1.1.31

$ cat ips.txt | mapcidr -aggregate-approx

1.1.1.0/27

CIDR based IP Filtering

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

$ mapcidr -il ip-list.txt -cl cirds.txt

IPS Conversion

IPv4 | IPv6 addresses can be converted from either the v6 to v4 notation or IPv4-mapped notation into IPv4 addresses using -t4 and -t6 to IPv4 and IPv6 respectively.

$ cat ips.txt 

1.1.1.1
2.2.2.2

$ mapcidr -il ipv4-list.txt -t6

00:00:00:00:00:ffff:0101:0101
00:00:00:00:00:ffff:0202:0202

Note: Not all IPv6 address can be converted to IPv4. You can only convert valid IPv4 represented IPv6 addresses.

IPS Filtering

IPv4 | IPv6 addresses can be filtered from an input list containing both IPv4/IPv6 formatted IPs using -f4 and -f6 flag.

$ cat ips.txt 

1.1.1.1
00:00:00:00:00:ffff:ad00:5400

$ mapcidr -il ips.txt -f4

1.1.1.1

CIDR Host Counting

In order to count number of hosts for a given CIDR or list of CIDR, use the following command.

$ echo 173.0.84.0/16 | mapcidr -count -silent

65536

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.