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2026-05-30· 5 min read

How to Check if a Domain is Secure — Free SSL, DNS, SPF Scanner | Vaarta

Learn how to check domain security for free. Scan SSL certificates, DNS records, SPF, DMARC, and HTTP security headers with AI-powered analysis.

Domain Security SSL DNS Cybersecurity

Why Domain Security Matters


Every day, thousands of websites are compromised due to misconfigured DNS records, expired SSL certificates, and missing security headers. A single vulnerability can lead to data breaches, phishing attacks, and loss of customer trust.


Step 1: Check Your DNS Records


DNS (Domain Name System) records control how your domain resolves. Key records to verify:


  • •A Record Points your domain to your server IP
  • •MX Records Handles email routing
  • •TXT Records Contains SPF, DKIM, and DMARC policies for email security
  • •NS Records Defines your authoritative nameservers

    • A missing or misconfigured MX record can expose your domain to email spoofing attacks.


    Step 2: Verify SSL Certificate


    An SSL certificate encrypts data between your server and visitors. Check:


  • •Certificate expiry Expired certificates trigger browser warnings
  • •Certificate issuer Trusted CAs like Let's Encrypt, DigiCert, or Comodo
  • •Certificate type EV, OV, or DV certificates offer different trust levels

    • Step 3: Audit HTTP Security Headers


    Security headers protect against common attacks:


  • •Content-Security-Policy (CSP) Prevents XSS attacks
  • •Strict-Transport-Security (HSTS) Forces HTTPS connections
  • •X-Frame-Options Prevents clickjacking
  • •X-Content-Type-Options Blocks MIME-sniffing attacks

    • Step 4: Check for Vulnerabilities


    Use tools like Vaarta.space to scan for:


  • •Open ports and exposed services
  • •Subdomain takeover risks
  • •DNS rebinding vulnerabilities
  • •Certificate transparency anomalies

    • Conclusion


    Regular security audits are essential. Use Vaarta.space to run a free scan and identify potential threats before attackers do.


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