# subfinder > A subdomain discovery tool that discovers valid subdomains for websites. > Designed as a passive framework to be useful for bug bounties and safe for penetration testing. > More information: . - Find subdomains for a specific domain: `subfinder -d {{example.com}}` - Show only the subdomains found: `subfinder --silent -d {{example.com}}` - Use a brute-force attack to find subdomains: `subfinder -d {{example.com}} -b` - Remove wildcard subdomains: `subfinder -nW -d {{example.com}}` - Use a given comma-separated list of resolvers: `subfinder -r {{8.8.8.8}},{{1.1.1.1}} -d {{example.com}}`