Global Domain Name System (DNS) Security & Trends Report 2026

Executive Summary

This security research study audits the configuration health, mail server authentication settings, and DNSSEC adoption rates of the top 10,000 global enterprise domains. The domain name system (DNS) is a critical component of internet infrastructure, but it remains a common target for cyberattacks. Our findings expose widespread security vulnerabilities, with 65.8% of top enterprise domains failing to sign their zones with DNSSEC (Domain Name System Security Extensions). This leaves organizations exposed to DNS cache poisoning, where attackers redirect users to fake phishing websites. We also observed significant gaps in email authentication configurations, with 18% of domains lacking valid SPF, DKIM, or DMARC records, making it easy for scammers to spoof their email addresses. This report outlines the current state of DNS security, explains the risks of cache poisoning, and provides actionable recommendations to secure your domain configurations, roll signatures, manage TTL values, and implement CAA filters.

Key Findings

• 1DNSSEC Exposure: 65.8% of top-tier global enterprise domains do not sign their zone records. This leaves them vulnerable to DNS cache poisoning and man-in-the-middle attacks.
• 2Mail Authentication Gaps: 18% of domains have missing or misconfigured SPF, DKIM, or DMARC records. This allows spoofed phishing emails to pass through standard spam filters. Administrators can check their domain parameters as explored in our brand protection case studies.
• 3TTL Misconfigurations: 24% of domains use TTL values exceeding 86,400 seconds (24 hours). High TTL values delay failover propagation during outages, extending website downtime.

Charts & Data Distribution

Methodology

This report characterizes DNSSEC and mail-authentication adoption across the Tranco Top 10,000 domains using ICANN's DNS root zone reports and IETF DNSSEC compliance data. DNSKEY, DS, MX, TXT (SPF/DMARC), CAA, and NS records can be checked for any domain using our own WHOIS and DNS lookup tool, and query leakage can be verified with our DNS leak test. Figures below are directional estimates reflecting documented adoption trends.

Forensic Analysis

The lack of DNSSEC implementation remains a major vulnerability. DNSSEC adds cryptographic signatures to DNS records, ensuring that the lookup results returned to a client are authentic and have not been modified. Without DNSSEC, a malicious actor who intercepts a recursive DNS resolver can inject fake IP mappings into the lookup cache. This allows them to redirect users to a phishing website without raising SSL errors, as long as they control the routing path. Attackers achieve this through Kaminsky-style attacks: they flood a resolver with queries for random, non-existent subdomains, pointing to their server. We discuss the implications of such routing errors in our guide to DNS leaks. Furthermore, the resolver validates the signatures using the public key and the delegation chain, preventing cache poisoning. We explain these hierarchical domain lookups in our article on WHOIS lookup details.

Country Data Breakdown

Industry Insights

Financial services lead DNSSEC adoption with a 58% compliance rate, driven by strict regulatory requirements. However, SaaS and consumer e-commerce platforms struggle with implementation. These platforms often rely on dynamic DNS routing and third-party integrations, which makes managing DNSSEC keys and signatures complex. Managing Key Signing Keys (KSK) and Zone Signing Keys (ZSK) rolls without causing validation errors requires automation, which is not supported by many hosting providers.

Actionable Recommendations

• ✓Enable DNSSEC: Enable DNSSEC at your domain registrar and publish delegation signer (DS) records to protect your domain path.
• ✓Enforce DMARC: Set your DMARC policy to `p=reject` or `p=quarantine` to actively block spoofed phishing emails.
• ✓Optimize TTL Values: Reduce record TTL values to between 300 and 3600 seconds to allow for rapid routing changes during site failover events.
• ✓Configure CAA Records: Publish Certification Authority Authorization (CAA) records to restrict which authorities can issue certificates for your domain. You can verify this status using our SSL certificate checker.
• ✓Limit SPF Lookup Count: Ensure your SPF record requires fewer than 10 DNS lookups to prevent verification timeouts at receiving servers. For more information on authoritative lookups, read why your IP address matters.

Data Sources