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Fierce is a DNS reconnaissance tool for locating non-contiguous IP space. Useful links: Domain Name System (DNS) Domain Names – Concepts and Facilities Domain Names – Implementation and Specification Threat Analysis of the Domain Name System (DNS) Name Servers (NS) State of Authority Record (SOA) Zone Transfer DNS Zone Transfer Protocol (AXFR) Incremental Zone Transfer in DNS (IXFR) Wildcard DNS Record Overview First, credit, where credit is due, fierce, was originally written by RSnake along with others at [Hidden Content]. This is simply a conversion to Python 3 to simplify and modernize the codebase. The original description was very apt, so I’ll include it here: Fierce is a semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains. It’s really meant as a pre-cursor to nmap, unicornscan, nessus, nikto, etc, since all of those require that you already know what IP space you are looking for. This does not perform exploitation and does not scan the whole internet indiscriminately. It is meant specifically to locate likely targets both inside and outside a corporate network. Because it uses DNS primarily you will often find mis-configured networks that leak internal address space. That’s especially useful in targeted malware. Changelog [1.5.0] – 2021-12-05 Added Official Python 3.9 support Official Python 3.10 support Changed Improved various error handling Removed Official Python 3.5 support [hide][Hidden Content]]