IP Lookup
Find IP location, ASN/ISP, and reverse DNS (PTR) details.
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Free online SEO, DNS, email authentication, security, and developer tools. Check SSL, DNS records, WHOIS, SPF, DKIM, DMARC, HTTP headers, and more — instantly and without registration.
Explore email tools: SPF, DKIM, DMARC and security tools: SSL & headers.
Popular Tools
Our most frequently used tools — start here for quick results
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DNS Lookup
Query DNS records (A, AAAA, MX, TXT, CNAME, NS) for any domain.
Try now POPULARSSL Checker
Inspect SSL/TLS certificates, validity, expiration, and chain information.
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Look up domain registration information and WHOIS records.
Try now FREESEO Checker
Free SEO analysis including meta tags, titles, Open Graph data, and technical SEO checks.
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Inspect HTTP response headers: security, caching, and CORS. Check status code, final URL, and copy headers as JSON or curl.
Try now FREESPF Checker
Check SPF (Sender Policy Framework) records for email authentication.
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Check DNS propagation worldwide for A, AAAA, MX, TXT, and CNAME records.
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SEO Tools (9) Most Popular
Analyze your website's SEO performance with our comprehensive SEO tools. Check meta tags, titles, and descriptions for proper optimization. Perform technical SEO audits to identify performance issues and Core Web Vitals. Validate redirects, HTTP headers, sitemaps, and robots.txt configuration. Preview how your content appears on social media platforms with Open Graph and Twitter Card previews.
Domains & DNS Tools (6)
Query DNS records, check WHOIS information, and diagnose domain configuration issues with our DNS and domain tools. Look up A, AAAA, MX, TXT, CNAME, and NS records for any domain. Verify DNS health and redundancy. Get detailed domain registration information including registrar, expiration dates, and name servers.
Email Tools (4)
Validate email authentication records to improve deliverability and prevent spoofing. Check SPF (Sender Policy Framework) records to verify authorized email senders. Validate DKIM (DomainKeys Identified Mail) signatures for email authentication. Verify DMARC (Domain-based Message Authentication) policies for email security and reporting.
Security Tools (6)
Inspect SSL/TLS certificates, verify HTTPS configuration, and check security headers. Analyze certificate validity, expiration dates, chain information, and SAN (Subject Alternative Name) entries. Ensure proper SSL configuration for secure website connections.
Developer Tools (6)
Essential utilities for developers and programmers. Encode and decode text using Base64 encoding. Generate secure random passwords with customizable length. Create UUID v4 (Universally Unique Identifier) values. View browser user agent strings and system information.