Open-source alternatives to Github Subdomains

ksubdomain是一款基于无状态子域名爆破工具，支持在Windows/Linux/Mac上使用，它会很快的进行DNS爆破，在Mac和Windows上理论最大发包速度在30w/s,linux上为160w/s的速度。 ksubdomain的发送和接收是分离且不依赖系统，即使高并发发包，也不会占用系统描述符让系统网络阻塞。

Subfinder is a security reconnaissance framework designed for subdomain enumeration and attack surface management. It functions as a discovery engine that identifies and maps internet-exposed infrastructure, cloud-hosted assets, and network ranges to maintain a comprehensive inventory of an organization's digital footprint. The project distinguishes itself through a modular, template-driven scanning engine that executes security checks against discovered assets. It leverages cloud-native asset discovery to query provider APIs and infrastructure metadata, while supporting distributed agent orc

Generates permutations, alterations and mutations of subdomains and then resolves them

Naabu is a port scanner library and tool that probes hosts for open ports using SYN, CONNECT, and UDP methods to identify active services. It functions as a Go library for embedding port scanning into programs, and as a standalone tool that accepts targets as hostnames, IP addresses, CIDR ranges, or ASN numbers. The tool discovers live hosts before scanning, filters ports by range or top lists, and can integrate with Nmap for service version detection. The project distinguishes itself through its SYN-based port probing approach that sends TCP SYN packets and analyzes responses without complet

dnsx is a fast and multi-purpose DNS toolkit allow to run multiple DNS queries of your choice with a list of user-supplied resolvers.

Aquatone is a web screenshot reconnaissance tool that captures full-page screenshots of web services discovered during network reconnaissance and groups them by visual similarity. It scans a list of hosts or domains for HTTP and HTTPS services on common and custom ports to find responsive web endpoints, then takes full-page screenshots of those pages for quick review. The tool accepts piped input from other tools and extracts URLs, domains, and IP addresses using regex pattern matching, making it pipeline-friendly for integration into existing workflows. It can also read XML output from Nmap

Go client to communicate with Chaos DB API.

Fast and customizable subdomain wordlist generator using DSL

This project is an open-source intelligence reconnaissance framework and recursive attack surface mapper. It functions as a containerized security scanner designed to map public-facing infrastructure, perform subdomain enumeration, and automate the gathering of open-source intelligence. The system employs a recursive discovery engine to iteratively explore target infrastructure, utilizing a plugin-based module architecture to extend scanning capabilities. It integrates third-party APIs for data enrichment and applies YARA rules across discovered assets to identify specific vulnerability patte

MassDNS wrapper written in go to enumerate valid subdomains using active bruteforce as well as resolve subdomains with wildcard filtering and easy input-output support.

Quickly discover exposed hosts on the internet using multiple search engines.

Small tool to Grab subdomains using Shodan api.

S3Scanner is a security tool for auditing public access and misconfigured permissions across S3-compatible storage providers. It functions as a storage auditor and security scanner designed to identify open buckets, enumerate publicly accessible objects, and exfiltrate data from misconfigured cloud environments. The project is distinguished by its integration with message brokers, allowing it to consume target lists for large-scale cloud infrastructure audits. It also provides utilities for dumping the entire contents of misconfigured buckets to local directories and calculating the total siz

Small, fast tool for performing reverse DNS lookups en masse.

A Powerful Subdomain Takeover Tool

Golang client for querying SecurityTrails API data

Subdomain enumeration tool

theHarvester is a command-line utility designed for gathering open-source intelligence and mapping an organization's external attack surface. It functions as a security information gathering framework that automates the collection of publicly available data to assist in reconnaissance and threat analysis. The tool utilizes a plugin-based architecture to execute isolated queries against various search engines and public databases. It employs asynchronous task execution to run multiple discovery operations in parallel, while a centralized pipeline aggregates and deduplicates findings from these

A fast sub domain brute tool for pentesters

Gitrob is a tool that scans public GitHub repositories for potentially sensitive files. It clones repositories and walks through their full commit history to flag files matching signatures for sensitive content, including files that may have been deleted in later commits. The tool presents its findings through a local web interface for interactive browsing and analysis. It serves results directly from memory without requiring a database, and allows users to save the full set of gathered findings to a JSON session file. Saved sessions can be loaded back into the web interface to continue analy

Information Gathering tool - DNS / Subdomains / Ports / Directories enumeration

Discover new target domains using Content Security Policy

Puredns is a fast domain resolver and subdomain bruteforcing tool that can accurately filter out wildcard subdomains and DNS poisoned entries.

Findomain is a subdomain enumeration and infrastructure analysis tool designed for attack surface mapping. It functions as a DNS reconnaissance suite that discovers subdomains using multiple data sources and API keys to identify the full extent of a target network. The system acts as an attack surface monitor by tracking subdomain changes over time and sending real-time alerts via webhooks when new assets are detected. It includes specialized capabilities for detecting DNS wildcards to filter false positives and resolving subdomain IPs through parallel resolution. The tool provides a workflo

Sudomy is a subdomain enumeration tool to collect subdomains and analyzing domains performing automated reconnaissance (recon) for bug hunting / pentesting