Free Online Tools

Look up DNS records (A, AAAA, MX, CNAME, TXT, NS) for any domain. Fast and free.

Look up domain WHOIS registration information — registrar, creation date, expiry, nameservers.

Locate any IP address on a map. Shows country, city, ISP, timezone, and coordinates.

Find your public IP address instantly. Shows IPv4, IPv6, ISP, location, and connection details.

Complete reference of common network ports and their services. Searchable and filterable.

Check SSL/TLS certificate details for any domain — expiry, issuer, chain, and security grade.

View HTTP response headers for any URL. Analyze security headers, caching, and server info.

Test CORS (Cross-Origin Resource Sharing) headers for any URL. Check if your API allows cross-origin requests.

Build URLs from components — protocol, domain, path, query parameters, and fragment. Copy formatted URL.

Build URL query strings from key-value pairs. Auto-encodes special characters. Export as URL or object.

Generate XML sitemaps from a list of URLs. Set priority, change frequency, and last modified date.

Generate Nginx server block configurations. Supports reverse proxy, SSL, gzip, caching, and redirects.

Generate Apache virtual host configurations. Supports SSL, rewrite rules, headers, and directory settings.

Generate Content Security Policy headers interactively. Select directives, sources, and copy the policy.

Check URL redirect chains. See each hop, status code, and final destination URL.

Extract all links from HTML content or a webpage. Filter by internal/external. Export as CSV or JSON.

Generate Wayback Machine archive links for any URL. Check if a page has been archived.

Generate .htaccess rules for redirects, rewrites, security headers, caching, and access control.

Validate and test your robots.txt file. Check if URLs are allowed or blocked for specific bots.

Generate JSON-LD structured data for SEO. Supports Article, Product, FAQ, How-to, and more schema types.