Sudomy – Tool To Analyze Domains and Collect Subdomains in Fast and Comprehensive Way

Sudomy Logo - Subdomain Enumeration Tool

Information gathering about websites is very important, to find juicy informations you need to digg a websites from main domain and also until subdomains. If the subdomain have vulnerability and you can exploit that, you will able to take over the main domain to. Because, main domain and subdomain is shared server usually.

To perform information gathering about subdomains or subdomains enumeration, i recommend a tool called “Sudomy – Subdomain Enumeration & Analysis“. This tool can help you find a record subdomains rapidly and also analyze a websites in comprehensive way. Coded by screetsec same developer with TheFatRat.


Sudomy is a subdomain enumeration tool, created using a bash script, to analyze domains and collect subdomains in fast and comprehensive way.

Features !

For recent time, Sudomy has these 9 features:
  • Easy, light, fast and powerful. Bash script is available by default in almost all Linux distributions. By using bash script multiprocessing feature, all processors will be utilized optimally.
  • Subdomain enumeration process can be achieved by using active method or passive method
    • Active Method
      • Sudomy utilize Gobuster tools because of its highspeed performance in carrying out DNS Subdomain Bruteforce attack (wildcard support). The wordlist that is used comes from combined SecList (Discover/DNS) lists which contains around 3 million entries
    • Passive Method
      • By selecting the third-party sites, the enumeration process can be optimized. More results will be obtained with less time required. Sudomy can collect data from these well-curated 16 third-party sites:
  • Test the list of collected subdomains and probe for working http or https servers. This feature uses a third-party tool, httprobe.
  • Subdomain availability test based on Ping Sweep and/or by getting HTTP status code.
  • The ability to detect virtualhost (several subdomains which resolve to single IP Address). Sudomy will resolve the collected subdomains to IP addresses, then classify them if several subdomains resolve to single IP address. This feature will be very useful for the next penetration testing/bug bounty process. For instance, in port scanning, single IP address won’t be scanned repeatedly
  • Performed port scanning from collected subdomains/virtualhosts IP Addresses
  • Testing Subdomain TakeOver attack
  • Taking Screenshotsof subdomains
  • Report output in HTML or CSV format

How Sudomy Works

Sudomy is using cURL library in order to get the HTTP Response Body from third-party sites to then execute the regular expression to get subdomains. This process fully leverages multi processors, more subdomains will be collected with less time consumption.


The following are the results of passive enumeration DNS testing of Sublist3r, Subfinder, and Sudomy. The domain that is used in this comparison is

Sudomy - Subdomain Enumeration ToolSubfinder - Subdomain Enumeration Tool xploitlabSublist3r - Subdomain Enumeration Tool xploitlab

Asciinema :


Sudomy is currently extended with the following tools. Instructions on how to install & use the application are linked below.

GobusterApache License 2.0not mandatory
httprobeTom Hudson –mandatory
nmapGNU General Public License v2.0not mandatory


pip install -r requirements.txt

Sudomy requires jq to run and pars. For more information, Download and install jq here

# Linux
apt-get install jq nmap phantomjs

# Mac
brew cask install phantomjs
brew install jq nmap 

If you have a Go environment ready to go, it’s as easy as:

export GOPATH=$HOME/go
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
go get -u
go get -u 

Download Sudomy From Github

# Clone this repository
git clone --recursive
# Go into the repository
sudomy --help 

Running in a Docker Container

# Pull an image from DockerHub
docker pull screetsec/sudomy:v1.1.0
# Run an image, you can run the image on custom directory but you must copy/download config sudomy.api on current directory
docker run -v "${PWD}/output:/usr/lib/sudomy/output" -v "${PWD}/sudomy.api:/usr/lib/sudomy/sudomy.api" -it --rm screetsec/sudomy:v1.1.0 [argument] 

Post Installation

API Key is needed before querying on third-party sites, such as Shodan, Censys, SecurityTrails, Virustotal, and BinaryEdge.

The API key setting can be done in sudomy.api file.

# Shodan
# URL :
# Example :
#      - SHODAN_API="VGhpc1M0bXBsZWwKVGhmcGxlbAo" 
# Censys
# URL :
# Virustotal
# URL :
# Binaryedge
# URL :
# SecurityTrails
# URL :


___         _ _  _
/ __|_  _ __| (_)(_)_ __ _  _
\__ \ || / _  / __ \  ' \ || |
|___/\_,_\__,_\____/_|_|_\_, |
                          |__/ v{1.1.0#dev} by @screetsec
Sud⍥my - Fast Subdmain Enumeration and Analyzer

Usage: sud⍥ [-h [--help]] [-s[--source]][-d[--domain=]]
Example: sud⍥ -d
         sud⍥ -s Shodan,VirusTotal -d
         sud⍥ -pS -rS -sC -nT -sS -d
Optional Arguments:
  -a,  --all           Running all Enumeration, no nmap & gobuster
  -b,  --bruteforce    Bruteforce Subdomain Using Gobuster (Wordlist: ALL Top SecList DNS)
  -d,  --domain        domain of the website to scan
  -h,  --help          show this help message
  -o,  --html          Make report output into HTML
  -s,  --source        Use source for Enumerate Subdomain
  -tO, --takeover      Subdomain TakeOver Vulnerabilty Scanner
  -pS, --ping-sweep    Check live host using methode Ping Sweep
  -rS, --resolver      Convert domain lists to resolved IP lists without duplicates
  -sC, --status-code   Get status codes, response from domain list
  -nT, --nmap-top      Port scanning with top-ports using nmap from domain list
  -sS, --screenshot    Screenshots a list of website
  -nP, --no-passive    Do not perform passive subdomain enumeration
       --no-probe      Do not perform httprobe 

To use all 16 Sources and Probe for working http or https servers:

sudomy -d

To use one of more source:

sudomy -s shodan,dnsdumpster,webarchive -d

To use one or more plugins:

sudomy -pS -sC -sS -d

To use all plugins: testing host status, http/https status code, subdomain takeover and screenshots

sudomy –all -d

To create report in HTML Format

sudomy –all -d –html

HTML Report Sample:

Sudomy Dashboard - Subdomain Enumeration Tool xploitlab
Sudomy Report - Subdomain Enumeration Tool xploitlab

Tools Overview

  • Youtube Videos : Click here



All notable changes to this project will be documented in this file.

Credits & Thanks

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