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subfinder

Fast passive subdomain enumeration tool.

Features • Install • Usage • API Setup • Library • Join Discord

Subfinder is a subdomain discovery tool that discovers valid subdomains for websites by using passive online sources. It has a simple modular architecture and is optimized for speed. subfinder is built for doing one thing only - passive subdomain enumeration, and it does that very well.

We have designed subfinder to comply with all passive sources licenses, and usage restrictions, as well as maintained a consistently passive model to make it useful to both penetration testers and bug bounty hunters alike.

Features

subfinder

  • Fast and powerful resolution and wildcard elimination module
  • Curated passive sources to maximize results
  • Multiple Output formats supported (Json, File, Stdout)
  • Optimized for speed, very fast and lightweight on resources
  • STDIN/OUT support for integrating in workflows

Usage

subfinder -h

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

Flags: INPUT: -d, -domain string Domain to find subdomains for -dL, -list string File containing list of domains to enumerate

SOURCE: -s, -sources string Sources to use for enumeration (-s crtsh,bufferover) -recursive Sources to use supports recursive enumeration -all Use all sources (slow) for enumeration -es, -exclude-sources string Sources to exclude from enumeration (-es archiveis,zoomeye)

RATE-LIMIT: -rate-limit int Maximum number of HTTP requests to send per second -t int Number of concurrent goroutines for resolving (-active only) (default 10)

OUTPUT: -o, -output string File to write output to (optional) -oJ, -json Write output in JSONL(ines) format -oD, -output-dir string Directory to write output (-dL only) -cs, -collect-sources Include all sources in the output (-json only) -oI, -ip Include host IP in output (-active only)

CONFIGURATION: -config string Configuration file for API Keys, etc -r string Comma separated list of resolvers to use -rL, -rlist string File containing list of resolvers to use -nW, -active Display active subdomains only -proxy string HTTP proxy to use with subfinder

DEBUG: -silent Show only subdomains in output -version Show version of subfinder -v Show Verbose output -nC, -nc Disable color in output -ls List all available sources

OPTIMIZATION: -timeout int Seconds to wait before timing out (default 30) -max-time int Minutes to wait for enumeration results (default 10)

Installation

Subfinder requires go1.17 to install successfully. Run the following command to get the repo -

go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest

Post Installation Instructions

Subfinder will work after using the installation instructions however to configure Subfinder to work with certain services, you will need to have setup API keys. The following services do not work without an API key:

Binaryedge, C99, Certspotter, Chinaz, Censys, Chaos, DnsDB, Fofa, Github, Intelx, Passivetotal, Recon.dev, Robtex, SecurityTrails, Shodan, Spyse, Threatbook, Virustotal, Zoomeye

Theses values are stored in the $HOME/.config/subfinder/config.yaml file which will be created when you run the tool for the first time. The configuration file uses the YAML format. Multiple API keys can be specified for each of these services from which one of them will be used for enumeration.

For sources that require multiple keys, namely Censys, Passivetotal, they can be added by separating them via a colon (:).

An example config file -

resolvers:
  - 1.1.1.1
  - 1.0.0.1
sources:
  - binaryedge
  - bufferover
  - censys
  - passivetotal
  - sitedossier
binaryedge:
  - 0bf8919b-aab9-42e4-9574-d3b639324597
  - ac244e2f-b635-4581-878a-33f4e79a2c13
censys:
  - ac244e2f-b635-4581-878a-33f4e79a2c13:dd510d6e-1b6e-4655-83f6-f347b363def9
certspotter: []
passivetotal:
  - sample-email@user.com:sample_password
securitytrails: []
shodan:
  - AAAAClP1bJJSRMEYJazgwhJKrggRwKA
github:
  - ghp_lkyJGU3jv1xmwk4SDXavrLDJ4dl2pSJMzj4X
  - ghp_gkUuhkIYdQPj13ifH4KA3cXRn8JD2lqir2d4

Running Subfinder

To run the tool on a target, just use the following command.

subfinder -d hackerone.com

               __    _____           __         
   _______  __/ /_  / __(_)___  ____/ /__  _____
  / ___/ / / / __ \/ /_/ / __ \/ __  / _ \/ ___/
 (__  ) /_/ / /_/ / __/ / / / / /_/ /  __/ /    
/____/\__,_/_.___/_/ /_/_/ /_/\__,_/\___/_/ v2.4.9

		projectdiscovery.io

Use with caution. You are responsible for your actions
Developers assume no liability and are not responsible for any misuse or damage.
By using subfinder, you also agree to the terms of the APIs used.

[INF] Enumerating subdomains for hackerone.com

www.hackerone.com
support.hackerone.com
links.hackerone.com
api.hackerone.com
o1.email.hackerone.com
go.hackerone.com
3d.hackerone.com
resources.hackerone.com
a.ns.hackerone.com
b.ns.hackerone.com
mta-sts.hackerone.com
docs.hackerone.com
mta-sts.forwarding.hackerone.com
gslink.hackerone.com
hackerone.com
info.hackerone.com
mta-sts.managed.hackerone.com
events.hackerone.com

[INF] Found 18 subdomains for hackerone.com in 3 seconds 672 milliseconds

The subdomains discovered can be piped to other tools too. For example, you can pipe the subdomains discovered by subfinder to httpx httpx which will then find running http servers on the host.

echo hackerone.com | subfinder -silent | httpx -silent

http://hackerone.com
http://www.hackerone.com
http://docs.hackerone.com
http://api.hackerone.com
https://docs.hackerone.com
http://mta-sts.managed.hackerone.com

If your enterprise uses source routing to choose network output, or your computer has many public network interfaces (eg: public Wi-Fi + 4G connection + Ethernet Wire + VPN), you might want to choose your output network by binding IP source. In this case, you can use -b option. In the example below, we have 3 network interfaces able to communicate to the Internet through 3 different outputs. Each output is chosen by binding one source IP with -b option.

ip addr

[...]
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether e8:b1:fc:50:90:a0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.87/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp3s0
       valid_lft 62538sec preferred_lft 62538sec
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
    link/none
    inet 192.168.254.70 peer 192.168.254.69/32 scope global tun0
       valid_lft forever preferred_lft forever
5: enx0c5b8f279a64: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 0c:5b:8f:a5:63:25 brd ff:ff:ff:ff:ff:ff
    inet 192.168.8.100/24 brd 192.168.8.255 scope global dynamic noprefixroute enx0c5b8f279a64
       valid_lft 86396sec preferred_lft 86396sec

subfinder -d hackerone.com -b 192.168.1.87

Subfinder with docker

Pull the latest tagged subfinder docker image:

docker pull projectdiscovery/subfinder:latest

Running subfinder using docker image:

docker -t projectdiscovery/subfinder:latest -d hackerone.com

Running subfinder using docker image with local config file:

docker run -v $HOME/.config/subfinder:/root/.config/subfinder -t projectdiscovery/subfinder -d hackerone.com

Subfinder Go library

Usage example:

package main

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"log"

	"github.com/projectdiscovery/subfinder/v2/pkg/passive"
	"github.com/projectdiscovery/subfinder/v2/pkg/resolve"
	"github.com/projectdiscovery/subfinder/v2/pkg/runner"
)

func main() {
	config := runner.ConfigFile{
		// Use the default list of resolvers by marshaling it to the config
		Resolvers: resolve.DefaultResolvers,
		// Use the default list of passive sources
		Sources: passive.DefaultSources,
		// Use the default list of all passive sources
		AllSources: passive.DefaultAllSources,
		// Use the default list of recursive sources
		Recursive: passive.DefaultRecursiveSources,
	}

	runnerInstance, err := runner.NewRunner(&runner.Options{
		Threads:            10, // Thread controls the number of threads to use for active enumerations
		Timeout:            30, // Timeout is the seconds to wait for sources to respond
		MaxEnumerationTime: 10, // MaxEnumerationTime is the maximum amount of time in mins to wait for enumeration
		YAMLConfig:         config,
	})

	buf := bytes.Buffer{}
	err = runnerInstance.EnumerateSingleDomain(context.Background(), "projectdiscovery.io", []io.Writer{&buf})
	if err != nil {
		log.Fatal(err)
	}

	data, err := io.ReadAll(&buf)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s", data)
}

Resources

License

subfinder is made with 🖤 by the projectdiscovery team. Community contributions have made the project what it is. See the Thanks.md file for more details.

Read the disclaimer for usage at DISCLAIMER.md and contact us for any API removal.