fierce ☆
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Description:
DNS reconnaissance tool for locating non-contiguous IP space
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: security dns reconnaissance pentesting enumeration networking
Install: brew install fierce
About:
Fierce is a Python-based DNS reconnaissance tool designed to locate non-contiguous IP space and subdomains within target networks. It automates the process of zone transfers and brute-force DNS enumeration to identify potential attack vectors. The tool helps security professionals map out an organization's external footprint and discover misconfigured DNS servers.
Key Features:
  • Automated DNS zone transfer attempts
  • Subdomain brute-forcing and enumeration
  • Identification of non-contiguous IP space
  • Python-based with no external dependencies
  • Comprehensive DNS record discovery
Use Cases:
  • Penetration testing and security assessments
  • External attack surface mapping
  • DNS infrastructure security auditing
  • Red team reconnaissance operations
Alternatives:
  • dnsrecon – More comprehensive DNS enumeration with additional record types and brute-force capabilities
  • sublist3r – Focuses specifically on subdomain enumeration using multiple sources and techniques
  • amass – Extensive attack surface mapping tool with passive and active reconnaissance features
Version History
Detected Version Rev Change Commit
Oct 10, 2024 6:31pm 0 VERSION_BUMP 1d15b573
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