# dalfox > A powerful open-source XSS scanner focused on automation. > More information: . - Scan a single URL for XSS vulnerabilities: `dalfox url {{https://example.com}}` - Scan a URL using a header for authentication: `dalfox url {{https://example.com}} {{[-H|--header]}} '{{X-My-Header: 123}}'` - Scan a list of URLs from a file: `dalfox file {{path/to/file}}` - Start Dalfox as a REST API server: `dalfox server --host {{0.0.0.0}} --port {{8080}}`