DNS Tools

Professional-grade DNS tools. Free for everyone.

No account required. All the lookups, analysis, discovery, and bulk operations you actually use during incidents, migrations, and daily work.

Single-target tools Bulk tools Guides & comparisons

Lookup & analysis

One domain, IP, or record at a time—multi-resolver DNS, WHOIS, SPF expansion, and discovery tools.

Domain Digger

Comprehensive DNS analysis across all record types with intelligent provider identification and ASN enrichment.

Open tool

Reverse DNS Lookup

PTR record lookup — map IP addresses back to hostnames quickly.

Open tool

SPF Analyzer

Fully expand includes, resolve IP ranges, label senders, and monitor lookup count against the 10-limit.

Open tool

DNS Lookup

Query any record type from Google, Cloudflare, Quad9, and OpenDNS at the same time. See disagreements instantly.

Open tool

CAA Checker

Check which Certificate Authorities are allowed to issue TLS certificates for a domain.

Open tool

DNSSEC Checker

Check DS, DNSKEY, and RRSIG records to confirm DNSSEC chain evidence.

Open tool

WHOIS Lookup

Structured RDAP + legacy WHOIS for domains, IPs, and ASNs. Clean, parseable results.

Open tool

Subnet Calculator

Calculate network details, broadcast address, and usable host ranges for any CIDR.

Open tool

Beta

Subdomain Finder

Discover subdomains via certificate transparency and passive DNS data. No active scanning required.

Open tool

Bulk operations

Paste a list and run the same check across up to 256 targets. Built for audits, migrations, and incident response.

Bulk DNS Lookup

Check the same record type across up to 256 domains in a single request. CSV export included.

Open tool

Bulk WHOIS

Bulk RDAP/WHOIS for mixed lists of domains, IPv4, IPv6, and ASNs. Ideal for investigations.

Open tool

Bulk FCrDNS

Validate forward-confirmed reverse DNS at scale for many hosts at once.

Open tool

Guides & comparisons

Workflow guides for developers and DevOps, plus honest comparisons with popular DNS utilities.

Guides

Comparisons

More tools and data views live under /data (provider health, identifier catalog).