Collect open source intel on an organisation like root domains and ASNs. More information: https://github.com/owasp-amass/amass/blob/master/doc/user_guide.md#the-intel-subcommand.
amass intel -addr 192.168.0.1-254
amass intel -active -addr 192.168.0.1-254
amass intel -whois -d domain_name
amass intel -org organisation_name
amass intel -asn asn
amass intel -o output_file -whois -d domain_name
amass intel -list