Findomain v0.9.3 - The Fastest And Cross-Platform Subdomain Enumerator


The fastest and cross-platform subdomain enumerator.

What Findomain can do?
It table gives you a idea why you should use findomain and what it can do for you. The domain used for the test was aol.com in the following BlackArch virtual machine:
Host: KVM/QEMU (Standard PC (i440FX + PIIX, 1996) pc-i440fx-3.1)
Kernel: 5.2.6-arch1-1-ARCH
CPU: Intel (Skylake, IBRS) (4) @ 2.904GHz
Memory: 139MiB / 3943MiB
The tool used to calculate the time, is the time command in Linux.
Enumeration Tool Search Time Total Subdomains Found CPU Usage RAM Usage
Findomain real 0m5.515s 84110 Very Low Very Low
Summary: 84110 subdomains in 5.5 seconds.

Features
  • Subdomains monitoring: put data to Discord, Slack or Telegram webhooks. See Subdomains Monitoring for more information.
  • Multi-thread support for API querying, it makes that the maximun time that Findomain will take to search subdomains for any target is 20 seconds.
  • Parallel support for subdomains resolution, in good network conditions can resolv about 2000 subdomains per minute.
  • DNS over TLS support.
  • Specific IPv4 or IPv6 query support.
  • Discover subdomains without brute-force, it tool uses Certificate Transparency Logs and APIs.
  • Discover only resolved subdomains.
  • Discover subdomains IP for data analisis.
  • Read target from user argument (-t) or file (-f).
  • Write to one unique output file specified by the user all or only resolved subdomains.
  • Write results to automatically named TXT output file(s).
  • Hability to query directly the Findomain database created with Subdomains Monitoring for previous discovered subdomains.
  • Hability to import and work data discovered by other tools.
  • Quiet mode to run it silently.
  • Cross platform support: Any platform, it's written in Rust and Rust is multiplatform. See the documentation for instructions.
  • Multiple API support.

Findomain in depth
See Subdomains Enumeration: what is, how to do it, monitoring automation using webhooks and centralizing your findings for a detailed guide including real world examples of how you get the most out of the tool.

How it works?
It tool doesn't use the common methods for sub(domains) discover, the tool uses Certificate Transparency logs and specific well tested APIs to find subdomains. It method make it tool the most faster and reliable. The tool make use of multiple public available APIs to perform the search. If you want to know more about Certificate Transparency logs, read https://www.certificate-transparency.org/
APIs that we are using at the moment:
Notes
APIs marked with **, require an access token to work. Search in the Findomain documentation how to configure and use it.
APIs marked with * can optionally be used with an access token, create one if you start experiencing problems with that APIs. Search in the Findomain documentation how to configure and use it.
More APIs?
If you know other APIs that should be added, comment here.

Development
In order to make sure Findomain will not be broken on some commit I have created the develop branch where new features and improvements are pushed before they go to master branch. In resume the difference is: develop branch and beta releases aren't ready for production purposes but testing or development purposes and master branch and non-beta releases are ready for production purposes. If you are a developer or want to be a beta tester of the new features that are added to Findomain then use the develop branch, otherwise always use the master branch. Every new feature is tested before it goes to master by the Findomain beta testers that are only (@sumgr0) at the moment, I will appreciate if you join to the testing process, just send me a DM in Twitter (@edu4rdshl).
If you are a packager of Findomain for X system distribution always go for the master branch if using git or non-beta releases if using releases model.
Build the development version:
You need to have rust, make and perl installed in your system first.
$ git clone https://github.com/Edu4rdSHL/findomain.git -b develop # Only the develop branch is needed
$ cd findomain
$ cargo build --release
$ ./target/release/findomain
To update the repository when new commits are added, just go to the folder where Findomain's develop branch was cloned and excute:
$ git pull
$ cargo build --release
$ ./target/release/findomain

Installation
We offer binarys ready to use for the following platforms (all are for 64 bits only):
If you need to run Findomain in another platform, continue reading the documentation.

Build for 32 bits or another platform
If you want to build the tool for your 32 bits system or another platform, follow it steps:
Note: You need to have rust, make and perl installed in your system first.
Using the crate:
  1. cargo install findomain
  2. Execute the tool from $HOME/.cargo/bin. See the cargo-install documentation.
Using the Github source code:
  1. Clone the repository or download the release source code.
  2. Extract the release source code (only needed if you downloaded the compressed file).
  3. Go to the folder where the source code is.
  4. Execute cargo build --release
  5. Now your binary is in target/release/findomain and you can use it.

Installation Android (Termux)
Install the Termux package, open it and follow it commands:
$ pkg install rust make perl
$ cargo install findomain
$ cd $HOME/.cargo/bin
$ ./findomain

Installation in Linux using source code
If you want to install it, you can do that manually compiling the source or using the precompiled binary.
Manually: You need to have rust, make and perl installed in your system first.
$ git clone https://github.com/Edu4rdSHL/findomain.git
$ cd findomain
$ cargo build --release
$ sudo cp target/release/findomain /usr/bin/
$ findomain

Installation in Linux using compiled artifacts
$ wget https://github.com/Edu4rdSHL/findomain/releases/latest/download/findomain-linux
$ chmod +x findomain-linux
$ ./findomain-linux
If you are using the BlackArch Linux distribution, you just need to use:
$ sudo pacman -S findomain

Installation Aarch64 (Raspberry Pi)
$ wget https://github.com/Edu4rdSHL/findomain/releases/latest/download/findomain-aarch64
$ chmod +x findomain-aarch64
$ ./findomain-aarch64

Installation Windows
Download the binary from https://github.com/Edu4rdSHL/findomain/releases/latest/download/findomain-windows.exe
Open a CMD shell and go to the dir where findomain-windows.exe was downloaded.
Exec: findomain-windows in the CMD shell.

Installation MacOS
$ wget https://github.com/Edu4rdSHL/findomain/releases/latest/download/findomain-osx
$ chmod +x findomain-osx.dms
$ ./findomain-osx.dms

Updating Findomain to latest version
To update Findomain to latest version, you can be in some scenarios:
  1. You downloaded a precompiled binary: If you are using a precompiled binary, then you need to download the new binary.
  2. You are using it from BlackArch Linux: Just run pacman -Syu
  3. You have cloned the repo and compiled it from source: You just need to go to the folder where the repo is cloned and run: git pull && cargo build --release, when finish, you have your executable in target/release/findomain.
  4. You downloaded a source code release and compiled it: You need to download the new source code release and compile it again.
  5. I used cargo install findomain: then just run cargo install --force findomain.

Access tokens configuration
In in section you can found the steps about how to configure APIs that need or can be used with access tokens.

Configuring the Facebook API
History
When I added the Facebook CT API in the beginning I was providing a Webhook token to search in the API, as consequence when a lot of users were using the same token the limit was reached and user can't search in the Facebook API anymore until Facebook unlocked it again. Since Findomain version 0.2.2, users can set their own Facebook Access Token for the webook and pass it to findomain setting the findomain_fb_token system variable. The change was introduced here. Also since 23/08/2019 I have removed the webhook that was providing that API token a nd it will not work anymore, if you're using findomain < 0.2.2 you are affected, please use a version >= 0.2.2.
Since Findomain 0.2.4 you don't need to explicity set the findomain_fb_token variable in your system, if you don't set that variable then Findomain will use one of our provided access tokens for the Facebook CT API, otherwise, if you set the environment variable then Findomain will use your token. See it commit. Please, if you can create your own token, do it. The usage limit of access tokens is reached when a lot of people use it and then the tool will fail.
Getting the Webhook token
The first step is get your Facebook application token. You need to create a Webhook, follow the next steps:
  1. Open https://developers.facebook.com/apps/
  2. Clic in "Create App", put the name that you want and send the information.
  3. In the next screen, select "Configure" in the Webhooks option.
  4. Go to "Configuration" -> "Basic" and clic on "Show" in the "App secret key" option.
  5. Now open in your browser the following URL: https://graph.facebook.com/oauth/access_token?client_id=your-app-id&client_secret=your-secret-key&grant_type=client_credentials
Note: replace your-app-id by the number of your webhook identifier and your-secret-key for the key that you got in the 4th step.
  1. You should have a JSON like:
{
"access_token": "xxxxxxxxxx|yyyyyyyyyyyyyyyyyyyyyyy",
"token_type": "bearer"
}
  1. Save the access_token value.
Now you can use that value to set the access token as following:
Unix based systems (Linux, BSD, MacOS, Android with Termux, etc):
Put in your terminal:
$ findomain_fb_token="YourAccessToken" findomain -(options)
Windows systems:
Put in the CMD command prompt:
> set findomain_fb_token=YourAccessToken && findomain -(options)
Note: In Windows you need to scape special characters like |, add ^ before the special character to scape it and don't quote the token. Example: set findomain_fb_token=xxxxxxx^|yyyyyyyy && findomain -(options)
Tip: If you don't want to write the access token everytime that you run findomain, export the findomain_fb_token in Unix based systems like putting export findomain_fb_token="YourAccessToken" into your .bashrc and set the findomain_fb_token variable in your Windows system as described here.

Configuring the Spyse API to use with token
  1. Open https://account.spyse.com/register and make the registration process (include email verification).
  2. Log in into your spyse account and go to https://account.spyse.com/user
  3. Search for the "API token" section and clic in "Show".
  4. Save that access token.
Now you can use that value to set the access token as following:
Unix based systems (Linux, BSD, MacOS, Android with Termux, etc):
Put in your terminal:
$ findomain_spyse_token="YourAccessToken" findomain -(options)
Windows systems:
Put in the CMD command prompt:
> set findomain_spyse_token=YourAccessToken && findomain -(options)
Note: In Windows you need to scape special characters like |, add ^ before the special character to scape it and don't quote the token. Example: set findomain_spyse_token=xxxxxxx^|yyyyyyyy && findomain -(options)
Tip: If you don't want to write the access token everytime that you run findomain, export the findomain_spyse_token in Unix based systems like putting export findomain_spyse_token="YourAccessToken" into your .bashrc and set the findomain_spyse_token variable in your Windows system as described here.

Configuring the Virustotal API to use with token
  1. Open https://www.virustotal.com/gui/join-us and make the registration process (include email verification).
  2. Log in into your spyse account and go to https://www.virustotal.com/gui/user/YourUsername/apikey
  3. Search for the "API key" section.
  4. Save that API key.
Now you can use that value to set the access token as following:
Unix based systems (Linux, BSD, MacOS, Android with Termux, etc):
Put in your terminal:
$ findomain_virustotal_token="YourAccessToken" findomain -(options)
Windows systems:
Put in the CMD command prompt:
> set findomain_virustotal_token=YourAccessToken && findomain -(options)
Note: In Windows you need to scape special characters like |, add ^ before the special character to scape it and don't quote the token. Example: set findomain_virustotal_token=xxxxxxx^|yyyyyyyy && findomain -(options)
Tip: If you don't want to write the access token everytime that you run findomain, export the respective system variable in your OS. For Unix based systems it can be done putting export VariableName="VariableValue" into your .bashrc. For Windows system it can be done as described here or here.

Subdomains Monitoring
Findomain is capable of monitor a specific domain or a list of domains for new subdomains and send the data to Slack, Discord or Telegram webhooks. All what you need is a server or your computer with PostgreSQL database server installed. Have in mind that you can have only a central server/computer with PostgreSQL installed and connect to it from anywhere to perform the monitoring tasks.
IMPORTANT NOTE: Findomain is a subdomains enumeration and monitor tool, not a job scheduler. If you want to run findomain automatically then you need to configure a job scheduler like systemd-timers or the well known CRON in *NIX systems, Termux in Android or MAC and the Windows Task Scheduler in Windows.
Options
You can set the following command line options when using the subdomains monitoring feature:
        --postgres-database <postgres-database>    Postgresql database.
--postgres-host <postgres-host> Postgresql host.
--postgres-password <postgres-password> Postgresql password.
--postgres-port <postgres-port> Postgresql port.
--postgres-user <postgres-user> Postgresql username.
System variables that can be configured
Findomain reads system variables to make use of webhooks. Currently Findomain support the following webhooks (click on them to see how to setup the webhooks):
The available system variables that you have are:
findomain_discord_webhook: Discord webhook URL.
findomain_slack_webhook: Slack webhook URL.
findomain_telegrambot_token: Telegram bot autentication token.
findomain_telegrambot_chat_id: Unique identifier for the target chat or username of the target channel.
Tip: If you don't want to write the webhook parameters everytime that you run findomain, export the respective system variable in your OS. For Unix based systems it can be done putting export VariableName="VariableValue" into your .bashrc. For Windows system it can be done as described here or here.
Default values while connecting to database server
Findomain have some default values that are used when they are not set. They are listed below:
  1. If you only specify the -m flag without more arguments or don't specify one of the options Findomain sets:
Subdomains monitoring examples
  1. Connect to local computer and local PostgreSQL server with specific username, password and database and push the data to both Discord and Slack webhooks
$ findomain_discord_webhook='https://discordapp.com/api/webhooks/XXXXXXXXXXXXXXX' findomain_slack_webhook='https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX' findomain -m -t example.com --postgres-database findomain --postgres-user findomain --postgres-host localhost --postgres-port 5432
  1. Connect to remote computer/server and remote PostgreSQL server with specific username, password and database and push the data to both Discord and Slack webhooks
$ findomain_discord_webhook='https://discordapp.com/api/webhooks/XXXXXXXXXXXXXXX' findomain_slack_webhook='https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX' findomain -m -t example.com --postgres-user postgres --postgres-password psql  --postgres-host 192.168.122.130 --postgres-port 5432
  1. Connect to remote computer/server and remote PostgreSQL server with specific username, password and database and push the data to Telegram webhook
$ findomain_telegrambot_token="Your_Bot_Token_Here" findomain_telegrambot_chat_id="Your_Chat_ID_Here" findomain -m -t example.com --postgres-user postgres --postgres-password psql  --postgres-host 192.168.122.130 --postgres-port 5432
  1. Connect to local computer using the default values
$ findomain_discord_webhook='https://discordapp.com/api/webhooks/XXXXXXXXXXXXXXX' findomain_slack_webhook='https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX' findomain -m -t example.com

Usage
See findomain -h/--help to see all the options.
For subdomains monitoring examples Subdomains Monitoring for more information.
You can use the tool in two ways, only discovering the domain name or discovering the domain + the IP address.

Examples
  1. Make a simple search of subdomains and print the info in the screen:
findomain -t example.com
  1. Make a search of subdomains and print the info in the screen:
findomain -t example.com
  1. Make a search of subdomains and export the data to a output file (the output file name in it case is example.com.txt):
findomain -t example.com -o
  1. Make a search of subdomains and export the data to a custom output file name:
findomain -t example.com -u example.txt
  1. Make a search of only resolvable subdomains:
findomain -t example.com -r
  1. Make a search of only resolvable subdomains, exporting the data to a custom output file.
findomain -t example.com -r -u example.txt
  1. Search subdomains from a list of domains passed using a file (you need to put a domain in every line into the file):
findomain -f file_with_domains.txt
  1. Search subdomains from a list of domains passed using a file (you need to put a domain in every line into the file) and save all the resolved domains into a custom file name:
findomain -f file_with_domains.txt -r -u multiple_domains.txt
  1. Query the Findomain database created with Subdomains Monitoring.
findomain -t example.com --query-database
  1. Query the Findomain database created with Subdomains Monitoring and save results to a custom filename.
findomain -t example.com --query-database -u subdomains.txt
  1. Import subdomains from several files and work with they in the Subdomains Monitoring process:
findomain --import-subdomains file1.txt file2.txt file3.txt -m -t example.com


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