Shodan is a search engine that discovers internet-connected devices.Censys provides insights into SSL certificates, exposed services, and misconfigured cloud assets.GrayHatWarfare indexes open S3 buckets to find exposed files.Google Dorking uses advanced search techniques to uncover sensitive information.Hunter.io helps find professional email addresses associated with domains.ZoomEye is a Chinese search engine for scanning exposed devices and services.BinaryEdge offers in-depth internet scanning for cybersecurity professionals.These search engines are useful for ethical hacking and security research.