Fast passive subdomain enumeration tool. Subfinder is a fast and efficient subdomain enumeration tool that can be used to find subdomains of a given domain. It uses a combination of techniques such as DNS lookups, web scraping, and API queries to find subdomains. Subfinder is designed to be fast and efficient, making it suitable for use in penetration testing and vulnerability assessment. It is also highly customizable, allowing users to specify the types of subdomains to search for and the level of recursion.
FEATURES
ALTERNATIVES
A network responder supporting various protocols with minimal assumptions on client intentions.
An information gathering tool for DNS, subdomains, ports, and directories enumeration.
CrowdSec is a behavior detection engine with a global IP reputation network.
PINNED

Mandos Brief Newsletter
A weekly newsletter providing cybersecurity leadership insights, industry updates, and strategic guidance for security professionals advancing to management positions.

PTJunior
An AI-powered penetration testing platform that autonomously discovers, exploits, and documents vulnerabilities while generating NIST-compliant reports.

CTIChef.com Detection Feeds
A tiered cyber threat intelligence service providing detection rules from public repositories with varying levels of analysis, processing, and guidance for security teams.

ImmuniWeb® Discovery
ImmuniWeb Discovery is an attack surface management platform that continuously monitors an organization's external digital assets for security vulnerabilities, misconfigurations, and threats across domains, applications, cloud resources, and the dark web.

Checkmarx SCA
A software composition analysis tool that identifies vulnerabilities, malicious code, and license risks in open source dependencies throughout the software development lifecycle.

Orca Security
A cloud-native application protection platform that provides agentless security monitoring, vulnerability management, and compliance capabilities across multi-cloud environments.

DryRun
A GitHub application that performs automated security code reviews by analyzing contextual security aspects of code changes during pull requests.