Find Every Subdomain, Not Just the Obvious Ones
Combine passive DNS, certificate transparency, web crawling, and active brute-forcing to discover subdomains that free tools miss.
Multi-Source Discovery Process
We don't rely on a single method. We combine them all.
Passive DNS
Historical DNS records from our network sensors and third-party feeds reveal subdomains that existed in the past.
Certificate Transparency
Monitor CT logs for new SSL certificates issued for your domains, catching subdomains the moment they're created.
Web Crawling
Discover subdomains referenced in HTML, JavaScript, and API responses across your web properties.
DNS Brute-Forcing
Active enumeration using custom wordlists and intelligent permutation patterns to find hidden subdomains.
Third-Party APIs
Aggregate data from VirusTotal, SecurityTrails, Shodan, and other threat intelligence sources.
Continuous Monitoring
Get instant Slack/email alerts when new subdomains appear, so you can assess them before attackers do.
Everything You Need for Subdomain Recon
Professional-grade enumeration without the enterprise price tag
Wildcard DNS Detection
Automatically filter out false positives from wildcard DNS configurations that pollute your results.
Historical Timeline
Track when subdomains were first seen, last seen, and how they've changed over time with our 5-year historical archive.
Bulk Export
Export results to CSV, JSON, or integrate directly with your tools via our REST API or Slack/webhook notifications.
IP Resolution & Port Data
See what IPs each subdomain resolves to and what ports/services are exposed, all in one view.
Who Uses Subdomain Discovery?
From bug bounties to enterprise security
Bug Bounty Hunters
Find forgotten staging servers, old dev environments, and shadow IT that internal teams don't know about. More attack surface = more bugs.
Security Teams
Get alerted when new subdomains appear in your infrastructure. Detect unauthorized deployments before they become security incidents.
Penetration Testers
Start every engagement with comprehensive reconnaissance. Find the subdomains that automated tools miss and your competitors won't find.
Threat Intelligence
Monitor competitor infrastructure, track phishing campaigns using similar domains, and build threat actor profiles based on domain patterns.
BarkScan vs. Free Tools
Why developers upgrade from Amass and Subfinder
| Feature | BarkScan | Amass | Subfinder |
|---|---|---|---|
| Passive DNS Sources | 12+ | 8 | 6 |
| Historical Data | ✓ 5 years | Limited | ✗ |
| Real-Time Monitoring | ✓ 24/7 | ✗ | ✗ |
| API Access | ✓ REST API | CLI only | CLI only |
| Setup Time | 0 min | 30+ min | 15+ min |
| Wildcard Filtering | ✓ Automatic | Manual | Manual |
Simple, Usage-Based Pricing
Only pay for what you use. No per-seat fees.
- 50 domains
- Unlimited scans
- All 12+ data sources
- Real-time monitoring
- Slack/webhook alerts
- 5-year history
- Unlimited domains
- Dedicated infrastructure
- Custom data sources
- SLA guarantee
- Priority support
Stop Missing Subdomains
Start with our free tier. Discover 3x more subdomains than free tools. Upgrade only when you need to.
Start Free Trial - No Credit Card Required