assetfinder

assetfinder is a reconnaissance tool designed to discover domains and subdomains associated with a target domain by aggregating data from multiple public sources. It queries services such as certificate transparency logs, threat intelligence platforms, and passive DNS providers to build a comprehensive list of related assets. The tool is widely used in bug bounty programs and penetration testing to map an organization’s external attack surface. It supports optional filtering to return only subdomains, allowing users to focus on specific reconnaissance needs. assetfinder is lightweight and easy to use, typically requiring only a single command to produce results, making it ideal for quick enumeration tasks. Its modular design allows contributors to add new data sources, improving coverage over time.