DNS Security Best Practices: Protecting Your Domain

Published November 29, 2025 · 8 min read

DNS Security: Protecting Your Domain's Foundation

DNS (Domain Name System) is the internet's address book. If compromised, attackers can redirect your traffic, intercept emails, and damage your reputation. Here's how to protect it.

Why DNS Security Matters

DNS attacks can lead to:

Traffic hijacking - Visitors sent to malicious sites
Email interception - Messages redirected to attackers
Phishing attacks - Fake sites impersonating your brand
Data theft - Sensitive information stolen
SEO damage - Search rankings destroyed

Essential DNS Security Measures

#### 1. DNSSEC (Domain Name System Security Extensions)

DNSSEC adds cryptographic signatures to DNS records, preventing:

DNS spoofing
Cache poisoning
Man-in-the-middle attacks

How to enable:

Check if your registrar supports DNSSEC

Enable it in your domain settings

Add DS records to parent zone

Test with online validators

#### 2. Registrar Lock

Prevent unauthorized transfers:

Enable transfer lock
Use registrar-level domain lock
Enable registry lock for critical domains

#### 3. Two-Factor Authentication

Protect your registrar account:

Enable 2FA on all accounts
Use authenticator apps (not SMS)
Keep recovery codes secure

#### 4. DNS Record Monitoring

Watch for unauthorized changes:

Monitor A, AAAA, MX, TXT records
Set up alerts for changes
Use DNS monitoring services

Important DNS Records for Security

SPF (Sender Policy Framework)

Prevents email spoofing:

\\\


v=spf1 include:_spf.google.com -all

\\\

DKIM (DomainKeys Identified Mail)

Cryptographically signs emails:

\\\


selector._domainkey.example.com TXT "v=DKIM1; k=rsa; p=..."

\\\

DMARC (Domain-based Message Authentication)

Tells receivers how to handle failed authentication:

\\\


_dmarc.example.com TXT "v=DMARC1; p=quarantine; rua=mailto:reports@example.com"

\\\

CAA (Certification Authority Authorization)

Controls which CAs can issue certificates:

\\\


example.com CAA 0 issue "letsencrypt.org"

\\\

DNS Health Checklist

Use our DNS Health Check to verify:

[ ] All expected records present
[ ] Records resolve correctly
[ ] No conflicting entries
[ ] Proper TTL settings
[ ] DNSSEC enabled
[ ] SPF record configured
[ ] DMARC record present
[ ] CAA record set

Common DNS Vulnerabilities

Zone Transfer Attacks

Problem: Unrestricted AXFR queries
Risk: Full DNS zone disclosure
Fix: Restrict zone transfers to authorized IPs

DNS Amplification

Problem: Open resolvers
Risk: Used in DDoS attacks
Fix: Disable recursion on authoritative servers

Subdomain Takeover

Problem: Dangling DNS records
Risk: Attackers claim abandoned resources
Fix: Remove unused CNAME/A records

Typosquatting

Problem: Similar domains registered by attackers
Risk: Phishing, brand damage
Fix: Register common typos proactively

DNS Provider Best Practices

When choosing a DNS provider:

Anycast DNS - Faster resolution, DDoS protection

DNSSEC support - Essential security feature

API access - For automation

DDoS protection - Built-in mitigation

Monitoring - Query analytics

Redundancy - Multiple nameservers

Recommended DNS Providers

For Security:

Cloudflare DNS
AWS Route 53
Google Cloud DNS
DNSimple

Features to look for:

DNSSEC signing
DDoS protection
Anycast network
Low TTL support
API for automation

Incident Response Plan

If DNS is compromised:

Immediate: Change registrar password + 2FA

Verify: Check all DNS records

Restore: Revert unauthorized changes

Lock: Enable all available locks

Monitor: Watch for further changes

Review: Audit access logs

Conclusion

DNS security is foundational to your online presence. Start by checking your DNS configuration with our DNS Health Tool and implement the security measures outlined above.

Check your DNS health → Check your DNS health