DomainShield

DNS Intelligence & Conflict Detection

Scan any domain's DNS records, detect misconfigurations, discover subdomains, and test changes before you make them.

Full Scan (all records + analysis)Query specific recordPreflight Check (test a change)

What DomainShield Does

Comprehensive DNS analysis in seconds

🔍

Full DNS Scan

Scan all record types — A, AAAA, MX, NS, TXT, SOA, CAA, CNAME — with SPF & DMARC analysis in one click.

🌐

Subdomain Discovery

Discover subdomains and scan each for dangling CNAMEs, takeover risks, and misconfigurations.

🛡️

Preflight Checker

Test a DNS change before you make it. Add a record and see what conflicts it would cause.

⚡

34+ Conflict Rules

Detect SPF lookup limits, DMARC gaps, CNAME loops, dangling records, and NS issues automatically.

Three steps to DNS clarity

Enter Domain

Type any domain or subdomain

→

Choose Mode

Full Scan, Query, or Preflight

→

Get Insights

Records, conflicts, and fixes

DomainShield

DNS Intelligence & Conflict Detection

Free and open source · No signup required · digdns.org