# subfinder > Discover 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 [d]omain: `subfinder -d {{example.com}}` - Show only the subdomains found: `subfinder -silent -d {{example.com}}` - Show only active subdomains: `subfinder -nW -d {{example.com}}` - Use all sources for enumeration: `subfinder -all -d {{example.com}}` - Use a given comma-separated list of [r]esolvers: `subfinder -r {{8.8.8.8,1.1.1.1,...}} -d {{example.com}}`