🌐 Web & SEO

21 free web & seo — DNS lookup, IP info, HTTP headers, meta tag checker, robots.txt tester, sitemap validator, keyword density and more. Live data, no sign-up required.

🌐 IP Address Lookup

Find your public IP address and geolocation instantly — or look up any IP address to see its country, city, ISP, and coordinates. No sign-up, completely free, results in under a second.

🚀 Website Speed Test

Test website response time, page size, compression, security headers, and cache headers from our servers — free online website speed analyser.

🔍 Website SEO Checker

Free SEO analysis tool. Score your site across 30+ checks — title tags, meta, headings, speed, security headers, Open Graph, Twitter Card, JSON-LD schema, AEO readiness, robots.txt, sitemap, and more. Download PDF report.

🔍 DNS Lookup

Look up DNS records for any domain: A, MX, CNAME, TXT, AAAA, and NS. Troubleshoot DNS propagation and email setup — free online DNS lookup.

📋 HTTP Status Codes

Complete HTTP status code reference: 1xx, 2xx, 3xx, 4xx, 5xx codes with descriptions and when to use each. Searchable and filterable — free online guide.

🌐 Subnet Calculator

Calculate subnet ranges, broadcast addresses, host counts, and IP class from any IPv4 CIDR notation. Free online subnet calculator.

✉️ Email Validator

Validate email address format instantly, with disposable-domain and role-address detection. Bulk validation of up to 10,000 addresses is a Pro feature. Free online email format checker.

🔒 Password Strength Checker

Check password strength instantly with a 6-level rating and entropy estimate. See exactly what to improve — free, runs entirely in your browser, password never sent anywhere.

🟢 Server Status Checker

Check if any website or server is up or down right now. See HTTP status code, response time, and server headers — free online uptime checker.

📡 HTTP Header Checker

Analyse pasted HTTP response headers for security, caching, and performance issues. Free online header checker — no URL fetching, paste headers from curl or DevTools.

💻 MAC Address Lookup

Look up the manufacturer (OUI) of any MAC address. Identify network device vendors from the first 6 digits of any hardware address — free online tool.

📈 UTM Builder

Build UTM tracking URLs for Google Analytics, Meta Ads, and email campaigns live as you type. Copy the complete tagged URL with one click — free online UTM builder.

📊 Keyword Density Checker

Analyse single-keyword frequency and density in any text. See the top 25 keywords ranked by count and percentage — free online keyword density tool.

🔍 User Agent Parser

Parse any user agent string to identify browser, OS, device type, and rendering engine. Detect bots and crawlers — free online user agent analyser.

📊 Open Graph Preview

Preview how your page looks when shared on Facebook, LinkedIn, and Twitter/X by pasting your HTML source. Test Open Graph and Twitter Card meta tags — free online OG previewer.

🏷️ Meta Tag Checker

Check pasted HTML for SEO meta tag completeness. Analyse title, description, canonical, viewport, and Open Graph tags — free online meta tag checker.

📋 Schema Markup Validator

Check JSON-LD schema markup for valid JSON syntax and the presence of @context and @type. Free online schema markup checker — paste raw JSON-LD or full HTML.

🔗 Link Extractor

Extract all href/src links from pasted HTML content. See external and internal links with duplicate removal — free online link extractor.

✅ Sitemap Validator

Validate pasted XML sitemap content for proper structure, HTTPS URLs, and duplicate detection. Free online sitemap validator — no URL fetching, paste your sitemap XML directly.

📏 Page Size Checker

Check the HTML markup size and DOM element counts of pasted page source. Get optimization tips based on inline script/style size and tag counts — free online page-size analyzer.

🤖 Robots.txt Tester

Test which URL paths are blocked or allowed by pasted robots.txt content. Enter a path and user-agent to check access rules — free online robots.txt tester, no URL fetching.

About Web & SEO

21 web and network diagnostic tools for developers, SEO professionals, and site owners. Look up IP addresses and DNS records, check HTTP headers and server status, validate meta tags and robots.txt, analyse keyword density, and test site speed — all using live data fetched in real time directly from the target server.

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⚙️ Developer Tools (32)🧮 Calculators (28)

Frequently Asked Questions

Are these web diagnostic tools free?

Yes. All tools on this page are completely free with no sign-up, no API key, and no usage limits for standard queries.

How current is the data from these web tools?

The tools fetch live data in real time. DNS records reflect current propagation state (which can take up to 48 hours after a change). HTTP headers and server status reflect the current server response at the moment of the request.

Why might results differ from other tools?

Results depend on live server state, geographic DNS resolver location, and CDN caching. If you see inconsistencies, wait a few minutes and re-run — DNS propagation and CDN caches update continuously.

Do these tools work on private/internal networks?

No. These tools query publicly reachable servers and DNS resolvers. Internal domains, private IPs, and localhost addresses are not accessible from a browser-based tool without a local proxy.