Free Webmaster Tools

DNS Lookup

Query A, AAAA, MX, NS, TXT, CNAME, and SOA records in one search. Useful for diagnosing DNS issues, verifying configuration after changes, or auditing a domain before purchase.

MX Lookup

See which mail servers handle email for a domain and their priority order. Essential for troubleshooting email delivery problems or verifying your mail provider is correctly configured.

NS Lookup

Find the authoritative nameservers for any domain. Helps verify DNS delegation is correct after a hosting or registrar migration.

TXT Records

View all TXT records including SPF, DKIM selectors, domain verification tokens (Google, Microsoft, Facebook), and custom entries.

CNAME Lookup

Check if a domain or subdomain is an alias pointing to another hostname. Commonly used to verify CDN, landing page, or SaaS integrations.

SPF Record Checker

Validate your Sender Policy Framework record to ensure only authorised servers can send email on behalf of your domain. Helps prevent spoofing.

DMARC Record Checker

Check your DMARC policy and reporting configuration. See if your domain enforces reject, quarantine, or none for failed email authentication.

CAA Record Checker

Check which Certificate Authorities are permitted to issue SSL certificates for your domain. Prevents unauthorised certificate issuance.

BIMI Record Checker

Check if a domain has Brand Indicators for Message Identification configured. BIMI displays your brand logo next to emails in supported inboxes.

Reverse DNS (PTR)

Look up the hostname associated with an IP address and verify forward-confirmed reverse DNS. Important for email deliverability and server identification.

HTTP Header Checker

Inspect all response headers returned by any URL including security headers, caching directives, server software, and content type. Useful for debugging and security audits.

Redirect Checker

Follow the full redirect chain from any URL to its final destination. See every 301, 302, and 307 hop. Essential for debugging SEO issues caused by redirect chains or loops.

HTTP/2 Protocol Test

Check whether a website supports HTTP/2 for faster page loading. HTTP/2 enables multiplexing, header compression, and server push for better performance.

HSTS Checker

Verify if a site enforces HTTPS via Strict Transport Security. Check max-age, includeSubDomains, and whether it meets the requirements for HSTS preload submission.

Open Graph & Social Preview

Preview how a URL will appear when shared on Facebook, Twitter/X, LinkedIn, and messaging apps. Check og:title, og:description, og:image, and Twitter Card tags.

XML Sitemap Checker

Verify your XML sitemap exists, is valid, and check the number of URLs or child sitemaps it contains. Helps ensure search engines can discover all your pages.

robots.txt Analyzer

Parse and review your robots.txt directives to see which bots are allowed or blocked and which paths are restricted. Identifies sitemap declarations too.

SSL Certificate Checker

View full SSL certificate details including issuer, expiry date, days remaining, signature algorithm, Subject Alternative Names (SANs), and certificate chain length. Catch expiring certificates before they cause browser warnings.

Email Blacklist Checker

Check if your domain or mail server IP is listed on 10 major DNS-based blacklists (Spamhaus, SpamCop, Barracuda, and more). Being blacklisted can silently block your emails from reaching customers.

Ping Test

Send ICMP ping packets to any host and measure round-trip latency, packet loss, and min/avg/max response times. A quick way to check if a server is online and responsive.

Port Checker

Test whether a specific TCP port is open on any host. Check common ports like HTTP (80), HTTPS (443), SSH (22), SMTP (25/587), MySQL (3306), and more.

IP Geolocation Lookup

Find the country, city, ISP, and organisation behind any IP address or domain. Useful for verifying server locations, investigating traffic sources, or checking CDN configuration.

WHOIS Lookup

Query the WHOIS database for any domain to find the registrar, registration and expiry dates, nameservers, and domain status codes. Supports .com, .net, .org, .co.uk, .io, and 20+ TLDs.

Domain Age Checker

Find out exactly when a domain was first registered and how old it is in years, months, and days. Domain age is one of many trust signals search engines consider when ranking websites.