App contender

#1 Subdomain Finder: Free Online Scanner & Enumeration Tool

Free Online Subdomain Scanner & Enumeration Tool

subdomainsfinder.com Security, Privacy & Compliance Listed Aug 20, 2026
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Global rank#7
Category rank#1
Lifetime points2
Tracked visits15
Duel record2–0
Selection rate100%
Claim for $50

The short version

What is #1 Subdomain Finder: Free Online Scanner & Enumeration Tool?

SubDomains Finder is an OSINT-based tool designed to discover subdomains associated with any domain by aggregating publicly available information from the internet without performing active scanning.

What makes it different

Operates entirely on passive data collection, meaning no active probes or packets are sent to target domains.

Product capabilities

Key features

  • Subdomain discovery
  • IP address identification (IPv4/IPv6)
  • ASN and hosting provider detection
  • Open port detection
  • Service detection
  • CVE mapping
  • CPE data identification
  • Geographic location detection
  • CDN and WAF detection

Ways to use it

Use cases

  • Reconnaissance phase of authorized engagements
  • Mapping attack surfaces
  • Discovering shadow IT assets
  • Monitoring organizational exposure

Who it is built for

Best for

Security researchersPenetration testersBug bounty huntersIT administratorsBlue teams

At a glance

Strengths & considerations

Strengths

  • No installation required
  • No API key required
  • No command line required
  • Fully browser-based
  • Passive data collection leaves no traces on target infrastructure

Things to consider

  • Relies on public data sources
  • May miss subdomains that are never indexed, behind firewalls, or use wildcard DNS
  • Data is cached and may not reflect real-time status
  • Not suitable for brute-forcing

Plan information

Pricing

Modelfree
Starting price0

The tool is free to use.

Free access

The entire tool is free.

Prices and plans can change. Confirm current terms on the official pricing page before purchasing.

Compatibility & availability

Technical details

Platforms & channels

Web browser

Languages

English

Quick answers

#1 Subdomain Finder: Free Online Scanner & Enumeration Tool FAQ

Is this tool legal to use?

Yes, it is legal because it only aggregates and displays publicly available information from the internet without performing active scanning or intrusive reconnaissance.

Do you scan target domains?

No, the tool does not perform active scanning. It queries a database of cached information gathered from public sources.

Is there an API available?

The developers are working on providing API access for programmatic queries and suggest contacting them for enterprise and business inquiries.

Explore nearby ideas

Tags

OSINTSubdomain EnumerationReconnaissancePassive ScanningCybersecurity

Research trail

Official sources

These pages were used for the factual profile above. They may change after the research date.

  1. Official website
  2. Official page — /about
  3. Official page — /faq

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