Open-source alternatives to Hakrevdns

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

A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration)

Golang client for querying SecurityTrails API data

Go client to communicate with Chaos DB API.

Fast and customizable subdomain wordlist generator using DSL

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

Find domains and subdomains related to a given domain

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

Discover new target domains using Content Security Policy

Knock is an attack surface management tool and DNS reconnaissance framework used for discovering and mapping an organization's external infrastructure. It functions as a subdomain enumeration tool and HTTP security scanner to identify reachable hosts and organizational assets. The project distinguishes itself by using a passive-active hybrid enumeration strategy, combining external API lookups with active wordlist brute-force attacks and DNS zone transfers. It includes a multi-stage validation pipeline that detects DNS wildcard records and verifies host connectivity to filter out false positi

Sublist3r is a subdomain enumeration tool and passive reconnaissance framework designed to discover subdomains by querying search engines and public intelligence sources. It functions as a security tool for identifying the digital footprint of a target domain. The project provides both passive enumeration through multi-source API aggregation and active discovery via a DNS brute force tool. It includes a TCP port scanner to identify active services and open ports on discovered subdomains, facilitating attack surface mapping. The tool can be used as a standalone utility or as a Python security

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

This tool generates a combination of domain names from the provided input. Combinations are created based on wordlist. Custom words are extracted per execution. Refer to Techniques section to learn more.

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

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

Small tool to Grab subdomains using Shodan api.

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

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

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

Mosint is an email OSINT framework and intelligence tool designed to gather data and identify digital footprints associated with email addresses. It functions as a suite of automated utilities for email validation, breach scanning, and social account discovery. The tool maps digital identities by linking email addresses to social media profiles and identifying related identities to expand the scope of investigations. It includes a breach scanner that checks email addresses against known database leaks and password dumps to detect compromised accounts. The framework also covers network intell

K8tools is a multi-stage attack framework that combines memory-only payload execution, credential testing, port forwarding, privilege escalation, and physical USB-based keystroke injection for comprehensive system compromise. At its core, the Ladon PowerShell module loads a multi-function scanner directly into memory, enabling command execution without writing files to disk, while supporting memory-only payload delivery that downloads and runs obfuscated shellcode or PowerShell commands to evade antivirus detection. The framework distinguishes itself through its breadth of integrated capabili

Apkleaks is a static analysis tool and security auditor designed to extract hardcoded secrets, API endpoints, and sensitive data from Android application packages. It operates as a secret scanner that analyzes compiled binaries without executing them to identify potential information leaks and insecure endpoints. The tool utilizes a regex-based data extraction engine to identify sensitive strings within decompiled code. It supports customization through JSON-defined search patterns and provides configuration flags to tune the behavior of the underlying disassembler. The analysis pipeline enc