Find subdomains of a domain. More information: https://github.com/owasp-amass/amass/blob/master/doc/user_guide.md#the-enum-subcommand.
amass enum -d domain_name
amass enum -active -d domain_name -p 80,443,8080
amass enum -brute -d domain_name
amass enum -o output_file -d domain_name
amass enum -o output_file -dir path/to/directory -d domain_name
amass enum -list