mschwager/fierce

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1808 stars · 215 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Fierce is a Python 3 DNS reconnaissance tool that locates non-contiguous IP space and hostnames for specified domains. It enumerates subdomains, attempts zone transfers, and traverses nearby IPs to find contiguous blocks, serving as a precursor to scanners like nmap.

Use cases

• enumerate subdomains for a target domain
• attempt DNS zone transfers during a pentest
• find non-contiguous IP space belonging to a company
• discover misconfigured networks leaking internal address space
• pre-scan reconnaissance before running nmap
• find nearby contiguous IP blocks around discovered hosts

When to choose

• you need lightweight DNS-based reconnaissance before port scanning
• you want to check domains for zone transfer vulnerabilities
• you're doing OSINT or authorized security assessments on a domain

When to avoid

• you need full port scanning or vulnerability exploitation (use nmap, nessus)
• you need broad internet-wide scanning
• you lack authorization to test the target domain

Facets

cli-tool · maturity active

security networking search-engine security networking penetration-testing windows python cli dns-reconnaissance zone-transfer subdomain-enumeration osint pentest command-line linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="mschwager/fierce")