ScanCannon is a Python-based tool designed for external attack surface discovery, enumeration, and reconnaissance across large-scale networks. The tool performs comprehensive scanning to identify IP addresses, subdomains, and other potential entry points that could serve as attack vectors. It utilizes multiple protocols including DNS and HTTP to gather information about target networks. ScanCannon focuses on external attack surface mapping, helping security professionals understand their organization's exposure from an external perspective. The tool is built to handle massive networks and can scale to accommodate large-scale reconnaissance operations. The tool provides enumeration capabilities that allow users to systematically catalog discovered assets and services. It supports various scanning techniques to ensure comprehensive coverage of the target attack surface.