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Security report for deadlinkchecker.com

DLC Websites · Technology · N/a

High risk. 6 critical or high findings in SSL/TLS, Network security and 2 other checks.

Security score

40/100

Risk levelHigh

0–100, higher is better. How it is calculated

DeadLinkChecker.com is a specialized online service offering free and subscription-based tools to detect broken links on websites, targeting webmasters and SEO professionals. The business operates a niche service focused on website quality and SEO enhancement, with a freemium model that includes manual checking and automated scheduled scans. The website content is professional and consistent with its stated purpose, providing clear service descriptions and user testimonials. Technically, the site uses standard web technologies including JavaScript, CSS, and Google Analytics, with basic security measures such as HTTPS and a Content-Security-Policy header. However, the absence of additional security headers and cookie consent mechanisms indicates room for improvement in privacy compliance and security posture. The WHOIS data is notably missing or unregistered, which raises concerns about domain legitimacy despite the professional appearance of the site. Overall, the site scores well on content quality and usability but should address privacy and security gaps to enhance trust and compliance.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

6 findings rated critical or high. Fix these first.

  1. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • Critical

      Unable to retrieve SSL certificate

      Could not establish secure connection to retrieve certificate information

      What to do: Check if the server is accessible and SSL/TLS is properly configured

  2. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • Critical

      Critical Service Exposed: RDP

      Port 3389 (RDP) is publicly accessible - RDP - Remote Desktop, prime ransomware target

      What to do: Immediately restrict access to RDP using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

  3. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  4. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

Need hands-on remediation? Email guard@offseq.com

Keep watching deadlinkchecker.com

This scan found 19 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
0
Security headers
30
Email security
70
DNS health
85
Network security
0
GDPR outside view
53
Average
40

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet · found on this site
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

The company behind DeadLinkChecker.com, identified as DLC Websites, appears to have been operating since 1999, focusing on SEO tools that help maintain website health by identifying broken links. Their market position is that of a niche provider offering accessible tools without requiring large SEO suites, appealing to small to medium-sized website owners and SEO professionals. Revenue likely derives from subscription packages for automated link checking services. The partnership ecosystem includes their own domain and blog subdomains, with no evident external business partners or subsidiaries. The business model emphasizes ease of use, free access, and incremental paid services, positioning them competitively in the SEO tools market. Growth indicators include the provision of multi-site and auto-check services, and integration of user accounts for enhanced features.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enforced and a Content-Security-Policy header to upgrade insecure requests. The presence of CAPTCHA on form submissions helps mitigate automated abuse. However, the lack of additional security headers such as X-Frame-Options and X-Content-Type-Options, absence of a published security policy or incident response contacts, and missing cookie consent mechanisms indicate gaps in comprehensive security and privacy compliance. No vulnerabilities or exposed sensitive data were detected in the content. The missing WHOIS data and domain registration inconsistencies pose a reputational risk and warrant further investigation. Overall, the security posture is adequate for the service offered but could be significantly improved to align with best practices and regulatory requirements.

Recommendations

  1. Implement additional HTTP security headers including X-Frame-Options, X-Content-Type-Options, and Referrer-Policy to enhance protection against common web attacks.
  2. Publish a clear cookie policy and implement a consent mechanism to comply with privacy regulations such as GDPR.
  3. Provide a dedicated security policy page and incident response contact information to improve transparency and trust.
  4. Investigate and resolve the missing WHOIS data issue to ensure domain legitimacy and reduce reputational risk.
  5. Enhance mobile optimization and accessibility features to improve user experience across devices.

Contact details published on the site

Addresses
Legal name
DLC Websites
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
DLC Websites
Description
Dead Link Checker provides free and subscription-based online tools to check websites for broken links, helping webmasters and SEOs maintain website quality and SEO rankings.
Key services
Free manual broken link checking, Multi-site checking, Automated scheduled link checking with email reports
Content quality
good
Branding
consistent

Technology

Stack
JavaScript, HTML5, CSS, Google Analytics
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Content-Security-Policy header present
  • Captcha on form submission

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

Transparency
basic

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenge.
  2. WHOIS data is missing or domain appears unregistered, which is unusual for an active service.
  3. Website provides a specialized SEO tool with free and paid options.
  4. No direct company contact emails or phone numbers found; contact is via form only.
  5. Security headers are minimal but include CSP.
  6. No cookie consent mechanism detected despite use of tracking.
  7. No explicit privacy or security certifications displayed.
  8. Content is safe and suitable for general audiences.
  9. Google Analytics is used for tracking.
  10. Website design and navigation are good and professional.
Technical notes

Notes

The website is built using standard web technologies including HTML, CSS, and JavaScript, with Google Analytics integrated for user tracking. The site uses a Content-Security-Policy header to enforce HTTPS and prevent mixed content issues. The form includes CAPTCHA to prevent automated abuse. The site lacks a detected CMS and appears to be custom-built or lightly templated. Performance is moderate with basic mobile optimization and accessibility features. SEO is supported by appropriate meta tags and Open Graph data. The absence of advanced frameworks or modern JavaScript libraries suggests a simple, maintainable codebase but may limit scalability or feature richness. Hosting provider details are not discernible from the content. Overall, the technical infrastructure is functional but could benefit from modernization and enhanced security configurations.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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