Free Open Ports Scan (Non-Intrusive)

Run a passive, non-intrusive scan for commonly exposed ports and services.
Identify external exposure and reduce attack surface.

  • Common port scan
  • Non-intrusive
  • Service banner hints
Scan Now - Free
No credit card requiredNon-intrusive scanningNo setup required
★★★★★

"Barrion's security scanning has helped us implement best security practices efficiently, saving us countless hours."

Sarah Chen

Head of Security

★★★★★

"We identified and fixed critical vulnerabilities before our platform launch, saving us from potential data breaches."

Marcus Anderson

CTO

★★★★★

"Barrion gives us peace of mind, knowing we're notified of any security issues. Exactly what our team needed."

Oskar Nilsson

Tech Lead

Enterprise-Grade Security
Trusted Worldwide
ISO 27001 Aligned
How it works

Scan in three simple steps

Fast, safe, non-intrusive checks with actionable results.

1

Start scan

Enter your URL, and click the start scan button to begin.

2

Scan runs

Barrion performs passive, read-only security checks with minimal site impact.

3

Take Action

Fix issues with step-by-step guidance and enable monitoring for continuous protection.

What this scan checks

Comprehensive Port Coverage:
  • Web services (80, 443, 8080, 8443)
  • SSH and remote access (22, 3389, 5900)
  • Database services (3306, 5432, 1433, 6379, 1521, 27017, 27018, 5984)
  • Email services (25, 110, 143, 993, 995)
  • File sharing (21, 22, 2049)
  • Modern services (Docker, WinRM, and 30+ critical ports)
Risk Assessment & Categorization:
  • 4-tier risk categorization (Critical, High, Medium, Low)
  • Dynamic scoring with risk-based point deduction
  • Port-specific security recommendations
  • Attack surface mapping with risk prioritization
Network Exposure Analysis:
  • External accessibility testing from external perspective
  • Comprehensive attack surface mapping
  • Service exposure analysis with security recommendations
  • Parallel scanning with proper timeouts for efficiency

Security Risks of Open Ports

Attack Surface Expansion:
  • Increases potential entry points for attackers
  • Exposes services that may have vulnerabilities
  • Provides reconnaissance information to attackers
  • Enables service-specific attack techniques
Common Vulnerabilities:
  • Default credentials and weak authentication
  • Outdated software versions with known exploits
  • Misconfigured services and unnecessary features
  • Unencrypted data transmission and storage
Compliance & Regulatory Issues:
  • Violates security best practices and standards
  • May breach compliance requirements (PCI DSS, HIPAA)
  • Increases audit findings and remediation costs
  • Demonstrates poor security posture to stakeholders

How to reduce exposure

Priority-Based Remediation:
  • Address Critical and High-risk ports first
  • Follow port-specific security recommendations
  • Use risk categorization to prioritize fixes
  • Implement dynamic scoring to track improvements
Network Security Controls:
  • Implement firewall rules to block unnecessary ports
  • Use network segmentation and VLAN isolation
  • Configure load balancers and reverse proxies
  • Implement IP whitelisting and access controls
Service Hardening:
  • Disable unused services and unnecessary features
  • Update software to latest secure versions
  • Configure strong authentication and access controls
  • Implement encryption for data in transit and at rest

Tool-specific questions

Is this port scan intrusive or harmful?

No, our port scan is completely non-intrusive and safe. We only perform lightweight connection attempts to common ports and never attempt to exploit vulnerabilities, brute-force credentials, or stress test services. The scan is designed to be respectful of your infrastructure.

Why do some ports appear open intermittently?

Port accessibility can vary due to CDN configurations, WAF rules, autoscaling, load balancing, or network routing changes. This is normal behavior in dynamic cloud environments. Regular monitoring helps track these changes over time.

Which ports are most commonly targeted by attackers?

Attackers frequently target SSH (22), RDP (3389), MySQL (3306), PostgreSQL (5432), Redis (6379), MongoDB (27017), and Oracle (1521). Our scan covers 30+ critical ports including these high-risk services, with risk categorization to help prioritize your security efforts.

What's the difference between open and filtered ports?

Open ports accept connections and respond to probes, while filtered ports are blocked by firewalls or other security controls. Filtered ports are generally more secure as they prevent external access, but they should still be monitored for configuration changes.

How often should I scan for open ports?

Regular port scanning is essential, especially after infrastructure changes, deployments, or security updates. Use Barrion's continuous monitoring to track port changes over time and receive alerts when new services become accessible externally.

What should I do if I find unexpected open ports?

Investigate immediately to determine if the service is legitimate and necessary. If not needed, close the port or restrict access. If required, ensure it's properly secured with strong authentication, encryption, and access controls. Document all findings and remediation steps.

Can I use this scan for compliance auditing?

Yes, our port scan results can help with compliance auditing by identifying external service exposure. However, supplement with internal scans and comprehensive security assessments for complete compliance coverage. Document all findings for audit purposes.

What's the best way to secure database ports?

Never expose database ports directly to the internet. Use VPN access, bastion hosts, or application-level connections. Implement strong authentication, encryption, network segmentation, and regular security updates. Monitor all database access and implement least privilege principles.

How does the risk categorization system work?

Our scan uses a 4-tier risk categorization system (Critical, High, Medium, Low) to help prioritize security efforts. Critical and High-risk ports require immediate attention, while Medium and Low-risk ports should be addressed based on your security requirements. The dynamic scoring system tracks improvements over time.

Why Choose Barrion?

Real-Time Results

Instant security analysis with detailed reports, giving you an immediate security overview

Comprehensive Checks

Multiple best-practice security checks in a single scan, for broad coverage

Actionable and Effective

Clear recommendations for fixes, helping you improve your security quickly and effectively

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General questions

Frequently Asked Questions

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If you have any other questions, feel free to reach out!

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