Features

ASN to CIDR Lookup
ORG to CIDR Lookup
DNS to CIDR Lookup
IP to CIDR Lookup
ASN/DNS/IP/ORG input
JSON/CSV/TEXT output
STD IN/OUT support

Installation

asnmap requires Go 1.18 to install successfully. To install, just run the below command or download pre-compiled binary from release page.

go install github.com/projectdiscovery/asnmap/cmd/asnmap@latest

Usage

asnmap -h

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

Usage:
  ./asnmap [flags]

Flags:
INPUT:
   -a, -asn string[]     target asn to lookup, example: -a AS5650
   -i, -ip string[]      target ip to lookup, example: -i 100.19.12.21, -i 2a10:ad40::
   -d, -domain string[]  target domain to lookup, example: -d google.com, -d facebook.com
   -org string[]         target organization to lookup, example: -org GOOGLE
   -f, -file string[]    targets to lookup from file

CONFIGURATIONS:
   -config string           path to the asnmap configuration file
   -r, -resolvers string[]  list of resolvers to use

UPDATE:
   -up, -update                 update asnmap to latest version
   -duc, -disable-update-check  disable automatic asnmap update check

OUTPUT:
   -o, -output string  file to write output to
   -j, -json           display json format output
   -c, -csv            display csv format output
   -v6                 display ipv6 cidr ranges in cli output
   -v, -verbose        display verbose output
   -silent             display silent output
   -version            show version of the project

Running asnmap

Input for asnmap

asnmap support multiple inputs including ASN, IP, DNS and ORG name to query ASN/CIDR information.

Input	ASN	DNS	IP	ORG
Example	`AS14421`	`example.com`	`93.184.216.34`	`GOOGLE`

Input can be provided either using specific options or STDIN which accepts all the supported formats. Single, multiple (comma-separated) and file input is supported for all the options.

echo GOOGLE | ./asnmap -silent

Example input for asnmap:

asnmap -a AS45596 -silent
asnmap -i 100.19.12.21 -silent
asnmap -d hackerone.com -silent
asnmap -org GOOGLE -silent

Default Run

asnmap by default returns the CIDR range for given input.

echo GOOGLE | ./asnmap

   ___   _____  __              
  / _ | / __/ |/ /_ _  ___ ____ 
 / __ |_\ \/    /  ' \/ _  / _ \
/_/ |_/___/_/|_/_/_/_/\_,_/ .__/
                         /_/    v0.0.1
		projectdiscovery.io

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

8.8.4.0/24
8.8.8.0/24
8.35.200.0/21
34.3.3.0/24
34.4.4.0/24
34.96.0.0/20
34.96.32.0/19
34.96.64.0/18
34.98.64.0/18
34.98.136.0/21
34.98.144.0/21

JSON Output

asnmap by default displays CIDR range, and all the information is always available in JSON format, for automation and post processing using -json output is most convenient option to use.

echo hackerone.com | ./asnmap -json -silent | jq

{
  "timestamp": "2022-09-19 12:14:33.267339314 +0530 IST",
  "input": "hackerone.com",
  "as_number": "AS13335",
  "as_name": "CLOUDFLARENET",
  "as_country": "US",
  "as_range": [
    "104.16.0.0/14",
    "104.20.0.0/16",
    "104.21.0.0/17"
  ]
}
{
  "timestamp": "2022-09-19 12:14:33.457401266 +0530 IST",
  "input": "hackerone.com",
  "as_number": "AS13335",
  "as_name": "CLOUDFLARENET",
  "as_country": "US",
  "as_range": [
    "2606:4700:8390::/44"
  ]
}

CSV Output

asnmap also support csv format output which has all the information just like JSON output

echo hackerone.com | ./asnmap -csv -silent

timestamp|input|as_number|as_name|as_country|as_range
2022-09-19 12:15:04.906664007 +0530 IST|hackerone.com|AS13335|CLOUDFLARENET|US|104.16.0.0/14,104.20.0.0/16,104.21.0.0/17
2022-09-19 12:15:05.201328136 +0530 IST|hackerone.com|AS13335|CLOUDFLARENET|US|2606:4700:9760::/44

Using with other PD projects

Output of asnmap can be directly piped into other projects in workflow accepting stdin as input, for example:

echo AS54115 | asnmap | tlsx
echo AS54115 | asnmap | dnsx -ptr
echo AS54115 | asnmap | naabu -p 443
echo AS54115 | asnmap | naabu -p 443 | httpx
echo AS54115 | asnmap | naabu -p 443 | httpx | nuclei -id tech-detect

Use asnmap as a library

Examples of using asnmap from Go code are provided in the examples folder.

Acknowledgements

Frank Denis for maintaining free IPtoASN database.

asnmap is made with ❤️ by the projectdiscovery team and distributed under MIT License.

danzajork/asnmap

Go CLI and Library for quickly mapping organization network ranges using ASN information.