DNS and Domain

DNS and Domain Tools

Use this hub for domain DNS records, certificate-related DNS and CT signals, robots.txt crawler guidance, XML sitemaps, canonical/noindex signals, title and description metadata, heading structure, Open Graph metadata, structured data, email policy records, reverse DNS, and public RDAP registry context. Results come from public resolvers and registries, so cache and resolver differences can matter.

DNS Lookup

Check A, AAAA, CNAME, MX, TXT, NS, CAA, and SOA.

MX Lookup

Check mail exchanger hosts and priorities.

CAA Lookup

Check certificate authority authorization records.

SSL Certificate Checker

Check issuer, expiry, SAN, and hostname match signals from CT records.

Robots.txt Checker

Check crawler directives and sitemap declarations for a public domain.

Sitemap Checker

Check XML sitemap structure, child sitemap samples, and URL signals.

Canonical / Noindex Checker

Check canonical and robots indexing signals for one public URL.

Meta Title / Description Checker

Check title tags, meta descriptions, duplicate metadata, and snippet preview signals.

HTML Heading / Content Structure Checker

Check H1-H6 headings, skipped levels, duplicates, and page structure signals.

Open Graph / Social Preview Checker

Check social preview tags, Twitter/X Card fields, and fallback metadata for one public URL.

Structured Data / JSON-LD Validator

Check JSON-LD blocks, schema.org types, malformed structured data, and Microdata/RDFa presence signals.

SPF Checker

Find SPF TXT policy signals.

DMARC Checker

Review _dmarc policy and report tags.

Reverse DNS Lookup

Check PTR records for public IP addresses.

WHOIS / RDAP Lookup

Review public registry records.

How these tools fit together

DNS Lookup is the broad record viewer. MX, SPF, DMARC, and CAA focus on common operational and security checks. SSL Certificate Checker adds public certificate transparency context, while Robots.txt Checker, Sitemap Checker, Canonical / Noindex Checker, Meta Title / Description Checker, HTML Heading / Content Structure Checker, Open Graph / Social Preview Checker, and Structured Data / JSON-LD Validator review crawler guidance, XML discovery files, page-level indexing signals, snippet metadata, heading structure, share-preview metadata, and schema markup. RDAP gives registry context, while reverse DNS maps a public IP back to PTR names when available.

FAQ

Are these authoritative DNS checks?

No. They use a recursive DNS over HTTPS resolver and may reflect cache state.

Can DNS results differ elsewhere?

Yes. Resolver, network, TTL, and propagation timing can change what you see.

Can I query arbitrary record types?

No. Supported types are intentionally limited for reliability and abuse control.