Open-source alternatives to Findomain

Findomain is a subdomain discovery tool and DNS resolver used for mapping an organization's external attack surface. It functions as a DNS infrastructure analyzer that searches for registered subdomains associated with a root domain to uncover undocumented infrastructure and services. The project includes an attack surface monitor that tracks changes to subdomains over time, using differential state monitoring to identify newly created or deleted assets. It provides real-time alerting via webhooks when changes in the monitored domain surface are detected. The system performs high-speed DNS r

Amass is a network attack surface mapper and reconnaissance framework designed to discover and map the external, internet-facing infrastructure of a target organization. It functions as an open source intelligence tool that identifies public network boundaries and locates hidden or forgotten subdomains to define an organization's total reachable footprint. The project utilizes passive-source data aggregation from external APIs and public databases alongside active DNS brute-forcing and recursive subdomain expansion. It employs a graph-based asset mapping system to visualize the relationships

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

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

Subfinder is a passive subdomain enumeration tool and DNS discovery utility designed to identify valid subdomains and hostnames associated with a specific organization or domain. It functions as a passive reconnaissance tool, gathering information about target domains by querying online databases without sending network traffic to the target infrastructure. The tool utilizes a pluggable provider architecture to separate discovery logic into independent modules, allowing for the integration of multiple passive-source APIs. It employs a concurrent-worker request model to execute network request

Knockpy is a DNS subdomain scanner and passive reconnaissance tool designed to discover subdomains and gather network intelligence. It functions as a DNS enumeration framework that combines active discovery methods with the ability to query external security services for passive domain data. The tool identifies targets through a combination of wordlist-based brute forcing, DNS zone transfers, and the aggregation of data from external security APIs. To ensure accuracy, it includes wildcard DNS detection to filter out false positives during the enumeration process. Beyond discovery, the system

Maskphish is a comprehensive security toolkit that integrates capabilities for digital forensics, network vulnerability scanning, open-source intelligence, penetration testing, and social engineering. It functions as a multi-purpose framework for automating reconnaissance and executing security audits across diverse network environments. The project features a specialized phishing and social engineering toolkit used for cloning websites, masking URLs, and deploying deceptive pages to capture user credentials. It also includes a remote access Trojan builder for generating platform-specific exe

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

Nettacker is an automated penetration testing framework designed to orchestrate reconnaissance, port scanning, and vulnerability detection. It functions as a network reconnaissance tool and vulnerability scanner that identifies open ports, fingerprints services, and checks systems against databases of known security flaws. The framework distinguishes itself by combining a web application crawler for discovering hidden paths via fuzzing with a vulnerability management system that persists scan results in a database to track historical assessments. It also includes specialized capabilities for

Subfinder is a passive subdomain enumeration tool and DNS asset discovery utility designed for mapping the external attack surface of a domain. It functions as a passive reconnaissance framework that identifies subdomains by querying curated third-party data sources and APIs without interacting directly with the target infrastructure. The tool utilizes a modular provider interface to integrate various passive sources and employs concurrent request orchestration to manage simultaneous network queries. It includes wildcard DNS filtering to identify and remove catch-all records, ensuring the res

Gau is a command-line tool and passive URL enumerator designed to discover and aggregate known and historical web addresses for specific target domains. It functions as a collection framework that retrieves domain-specific data from public web archives and threat intelligence providers. The tool focuses on passive reconnaissance and open-source intelligence research to map attack surfaces without sending requests directly to target infrastructure. It aggregates data from multiple external sources to identify accessible web endpoints and forgotten pages. The system includes capabilities for r

RED_HAWK is a penetration testing framework and reconnaissance suite designed for information gathering and vulnerability assessment. It provides a toolkit for infrastructure reconnaissance, technology stack detection, automated web spidering, and security scanning. The project distinguishes itself through a multi-stage reconnaissance pipeline that maps attack surfaces. This includes DNS-based infrastructure mapping to resolve network layouts and pattern-based detection to identify specific content management systems and server stacks. The system covers a broad range of capabilities includin

fuzzDicts is a repository of curated wordlists and dictionaries designed for web application fuzzing. It provides collections of strings and payloads used to discover hidden files, subdomains, and security vulnerabilities. The project includes specialized libraries for different security testing vectors, such as dictionaries for common request and cookie parameters, lists of common subdomain prefixes, and collections of passwords and default vendor credentials for brute-force testing. It also maintains a security payload library containing character sequences used to identify flaws like SQL i

This project is a bug bounty target dataset and security asset list. It serves as a structured repository of reachable network assets, domains, and applications eligible for security testing across multiple vulnerability disclosure programs. The dataset is designed to support bug bounty reconnaissance, attack surface mapping, and security target analysis. It provides organized scopes and target lists to help identify valid assets for security testing and vulnerability research workflows. The repository utilizes automated scraping pipelines and platform API integration to synchronize data. It

Sn1per is a vulnerability management platform and penetration testing orchestrator designed to automate reconnaissance, vulnerability scanning, and exploit verification. It functions as a dockerized security toolkit that coordinates multiple tools into a unified automated pipeline to identify security flaws across network and web assets. The platform features an attack surface manager for discovering internet-facing assets through OSINT, DNS enumeration, and certificate transparency. It distinguishes itself with an AI-powered security analyzer that uses large language models to summarize scan

SubDomainizer is a security scanning utility designed to map web infrastructure and identify sensitive information exposure. It functions as a reconnaissance tool that aggregates data from web pages, local files, and remote code hosting services to provide a comprehensive assessment of a target's attack surface. The tool specializes in discovering hidden subdomains and infrastructure entry points through recursive web crawling and the analysis of SSL certificate metadata. It further secures environments by scanning source code and external repositories for exposed API keys, passwords, and oth

recon-ng is an open source intelligence reconnaissance framework designed to automate the collection and aggregation of public information. It is a modular intelligence tool that utilizes a system of pluggable modules to harvest target data, resolve DNS queries, and parse web content. The framework is built as an API-driven tool with a programmatic interface to integrate with other security workflows. It is provided as a containerized application, using Docker to ensure a consistent environment for running reconnaissance tasks and managing a persistent data store. Its capabilities cover exte

Gowitness is a system for rendering web interfaces at scale to capture visual snapshots, HTTP metadata, and network scan results. It functions as a headless browser screenshot tool and a web surface mapper used to identify and visually document the attack surface of network ranges and URL lists. The tool includes a screenshot gallery server that provides a web-based interface for browsing, filtering, and managing a database of captures. It specifically serves as an Nmap target visualizer, parsing network scan results to automatically capture screenshots of discovered web services. Capabiliti

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

Lockdoor-Framework is a modular penetration testing suite designed to facilitate comprehensive security assessments through a centralized command-line interface. It functions as an integrated platform for reconnaissance, vulnerability scanning, and the exploitation of target systems, providing a unified environment for managing complex security workflows. The framework distinguishes itself through a modular plugin architecture that allows for the extension of core capabilities without modifying the underlying codebase. It incorporates an automated reconnaissance pipeline to map attack surface

Rengine is an automated reconnaissance framework and vulnerability management platform designed for attack surface monitoring. It functions as a centralized hub for discovering subdomains and open ports, gathering open-source intelligence, and tracking security flaws across target networks. The system integrates large language models to analyze reconnaissance data and generate vulnerability descriptions and insights. It distinguishes itself through a plugin-based tool integration that wraps external security scanning binaries and a target mapping system that tracks changes to assets over time

Waybackurls is a command-line OSINT tool that retrieves every known URL for a given domain from the Wayback Machine archive. It functions as a domain reconnaissance utility, discovering forgotten API endpoints, legacy pages, and hidden files by querying the public web archive API. The tool processes domains independently and statelessly, reading domain names from standard input and streaming discovered URLs line-by-line to standard output. This design enables seamless integration into Unix command pipelines, allowing users to chain waybackurls with other tools for filtering, sorting, and furt

Gobuster is a command-line security utility designed for brute-force discovery of hidden infrastructure and content. It operates by systematically testing wordlists against target network services to identify files, directories, subdomains, and cloud storage buckets. The tool utilizes a concurrent worker pool to execute these requests in parallel, ensuring efficient scanning across various network environments. The project distinguishes itself through a modular plugin architecture that supports multiple discovery modes, including HTTP, DNS, and TFTP. This design allows for protocol-agnostic r

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

shhgit is a static analysis security tool and secret detection scanner designed to identify leaked credentials, API tokens, and private keys. It functions as a security auditor for version control systems, analyzing both local files and remote repositories across platforms including GitHub, GitLab, and Bitbucket. The tool utilizes a detection engine based on signature-matching, custom regular expressions, and entropy checks to locate sensitive data. It allows for the use of custom search signatures and queries to identify non-standard secrets that may not be covered by predefined patterns. T

Small tool to Grab subdomains using Shodan api.