getaltname

GSAN (Get Subject Alternative Names) is a tool designed to extract Subject Alternative Names (SAN) from SSL certificates of HTTPS servers, enabling the identification of DNS names and virtual hosts, particularly in environments involving internal or self-signed certificates. Its primary use case involves directly connecting to servers to retrieve SAN data without relying on Certificate Transparency logs, and it supports batch processing via file input and integration with other tools like Shodan or Nmap for enhanced functionality and output options. Notable features include flexible output capabilities and support for Docker installation, allowing seamless deployment and usage in various environments.