Fierce is presented by Schwager, in Fierce: A DNS reconnaissance tool for locating non-contiguous IP space (https://github.com/mschwager/fierce), GitHub © 2018, as follows:
Fierce is a semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains.
Fierce uses zone transfer, dictionary attacks, and reverse resolution to gather hostnames and subdomains along with the IP addresses of a domain, and it has the option to search for related names (for example, domain company.com, corpcompany.com, or webcompany.com). In the following example, we will use search to identify hostnames of google.com:
fierce -dns website
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