All Free Online Tools

Look up any ASN to find network ownership, allocated IP prefixes, routing policies, and peering information. Essential for network operations and research.

Analyze BGP routing for any IP prefix. View AS paths, identify routing anomalies, check prefix origin validation, and understand internet routing topology.

Upload and analyze server log files. Identify error patterns, traffic spikes, top IPs, and status code distributions with visual charts and filtering.

Test your CDN's performance from locations worldwide. Measure response times, cache hit rates, TTFB, and identify optimization opportunities.

Look up existing SRV records or generate new ones for your services. Support for common protocols like SIP, XMPP, LDAP, and custom services.

Inspect HTTP response headers for any URL. Check security headers, caching directives, CORS settings, and server configuration at a glance.

Build and test API requests with a visual interface. Set custom headers, query parameters, request body, and see formatted responses with timing data.

Run a comprehensive domain health check covering DNS records, SSL/TLS certificate, email authentication (SPF/DKIM/DMARC), HTTP security headers, blacklist status, and WHOIS details — all in one report.

See your browser's user agent string and what it reveals about your browser, operating system, and device. Understand how websites identify your browser.

Instantly see your screen resolution, browser viewport size, device pixel ratio, and color depth. Useful for responsive design testing and display troublesho...

Find your device's MAC address with our step-by-step guides for every operating system. Understand what MAC addresses are and why they're important.

See what information websites can collect about your browser. Analyze canvas fingerprints, WebGL data, installed fonts, and calculate your fingerprint unique...

View your browser's WebGL renderer, vendor, extensions, and hardware capabilities. Identify GPU fingerprint data exposed via WebGL to websites you visit.

Count words, characters (with and without spaces), sentences, and paragraphs. Get estimated reading and speaking times for your content.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case and kebab-case instantly — free and fully in your browser.

Compare two versions of text to see exactly what changed. Side-by-side view with highlighted additions, deletions, and modifications for easy review.

Extract and view EXIF metadata from your images. See camera model, exposure settings, GPS coordinates, timestamps, and all embedded image data.

Convert colors between RGB, HEX, HSL, CMYK, and more. Preview colors in real-time, generate complementary palettes, and copy values for your projects.

In-depth guide comparing IPv4 and IPv6 protocols: address formats, header differences, NAT, security implications, and the practical path to IPv6 adoption.

Complete reference guide to DNS record types: A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, PTR and more. Includes real examples, RFC references, and use cases.

Step-by-step guide to diagnosing and fixing email deliverability problems. Covers SPF/DKIM/DMARC setup, blacklist removal, bounce analysis, and inbox testing.

Check DNS records for any domain instantly. Our free DNS lookup tool queries authoritative nameservers to show A, AAAA, MX, TXT, NS, SOA, and CNAME records.

Look up A and AAAA records for any domain to find its IPv4 and IPv6 addresses. Troubleshoot DNS issues and verify domain configurations with our free tool.

Look up MX records for any domain to identify mail servers and their priorities. Essential for troubleshooting email delivery issues and verifying email setup.

Look up NS records to identify the authoritative nameservers for any domain. Verify DNS delegation and troubleshoot nameserver configuration issues.

Look up SOA records to view domain authority details including primary nameserver, admin contact, serial number, and zone timing parameters.

Look up TXT records to verify domain ownership, check SPF, DKIM, and DMARC settings, and view all text-based DNS configurations for any domain.

Check if your DNS changes have propagated worldwide. Our tool queries 50+ global DNS servers to show real-time propagation status for any record type.

Benchmark public DNS resolvers (Cloudflare, Google, Quad9 and more) from our server in real time. Compare lookup latency and pick the fastest DNS for your network.

Analyze your domain's DNS security posture. Check DNSSEC implementation, identify misconfigurations, and get recommendations for improved DNS security.

Check email authentication records for any domain. Validate DKIM signatures, SPF policies, and DMARC settings to improve email deliverability and security.

Look up the hostname associated with any IP address using reverse DNS. Verify PTR records and identify servers by their IP addresses instantly.

Test whether your DNS resolver supports encrypted DNS protocols including DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT). Confirm your queries are private and n...

Test whether a domain's nameservers allow unauthorized DNS zone transfers (AXFR). Identify zone transfer misconfigurations that expose your full DNS record set.

Run a comprehensive DNS health check for any domain. Verify DNS records, DNSSEC validation, propagation consistency, and configuration quality with a graded scorecard and actionable recommendations.

Paste up to 10 hostnames or IP addresses and resolve A, AAAA, MX, NS and SPF records (or reverse DNS for IPs) in one pass. Free, no account, pure DNS lookups.

Format and validate your JSON data instantly. Our free tool checks syntax, beautifies with proper indentation, and can minify JSON for production use.

Test your regular expressions in real-time. See matches highlighted, view capture groups, and debug your regex patterns with instant feedback.

Decode any JWT to view its header, payload claims, and signature. Inspect expiration times, issuers, and custom claims for debugging authentication flows.

Minify your CSS and JavaScript code to reduce file size. Remove unnecessary whitespace, comments, and optimize for faster page loads in production.

Format your SQL queries with proper indentation and line breaks. Support for multiple SQL dialects with customizable formatting preferences.

Generate cryptographic hashes from text or files. Support for MD5, SHA1, SHA256, SHA384, SHA512, and other algorithms. Compare hashes for integrity verificat...

Calculate multiple hash types at once from your input. See MD5, SHA1, SHA256, SHA512, and other hashes side-by-side for quick comparison and verification.

Encode text to Base64 or decode Base64 strings back to plain text. Support for standard and URL-safe Base64 encoding with proper UTF-8 handling.

Encode special characters for safe URL usage or decode percent-encoded strings. Essential for handling query parameters, API calls, and web development.

Encode special characters to HTML entities or decode named, decimal, and hex entities back to readable text — free and fully in your browser.

Convert between Unix timestamps and human-readable dates. Support for seconds and milliseconds, multiple timezones, and various output formats.

Validate your cron expressions and see when they'll run next. Get human-readable explanations of cron syntax and preview upcoming execution times.

Convert between CSV and JSON formats effortlessly. Upload files or paste data, customize column mapping, and export in your preferred format.

Generate QR codes for any content including URLs, text, WiFi networks, and vCards. Customize colors, add logos, and download in high-resolution formats.

Convert YAML to JSON and JSON to YAML instantly in your browser. Free bidirectional converter with validation, error messages and copy-to-clipboard.

Generate realistic random user-agent strings for Chrome, Firefox, Safari and Edge across Windows, macOS, Linux, Android and iOS. Free, in bulk.

Generate Open Graph and Twitter Card meta tags with a live share-preview. Type your title, description, URL and image, copy the ready-made <head> tags.

Look up WHOIS data for any domain to see registration details, nameservers, registrar information, creation and expiration dates, and contact information.

Look up WHOIS data for any IP address to find the network owner, ASN, allocated range, abuse contact, and registration details from regional registries.

Discover all subdomains for any domain. Uses certificate transparency logs, DNS enumeration, and other techniques to map the complete domain infrastructure.

Check any URL to verify it's accessible and working. See HTTP status codes, redirect chains, response times, and identify broken or problematic links.

Analyze any website's robots.txt file. Validate syntax, check crawl directives, identify blocked resources, and ensure proper search engine configuration.

See which AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended) a website allows or blocks in robots.txt, and whether it publishes an llms.txt.

Generate a correct robots.txt in your browser: choose a crawl policy, block paths, add a sitemap and crawl-delay, and opt out of AI crawlers like GPTBot and ClaudeBot.

Paste email headers to trace the complete delivery path, verify SPF/DKIM/DMARC authentication, identify the originating IP, and detect potential spoofing.

Check your email content before sending. Our spam analyzer identifies trigger words, calculates spam score, and provides tips to improve deliverability.

Validate email addresses by checking syntax, domain MX records, and common deliverability factors. Instantly confirm whether an email address is properly for...

Comprehensive email deliverability scorecard for any domain. Check SPF, DKIM, DMARC, MX records, blacklist status, and get an overall deliverability grade.

Look up BIMI DNS records for any domain. Verify brand logo display in email clients and check VMC certificate status for email brand authentication.

Test MTA-STS policy for any domain per RFC 8461. Verify DNS TXT record, fetch the policy file, and identify email transport encryption misconfigurations.

Look up TLSRPT DNS records for any domain per RFC 8460. Verify TLS reporting rua endpoints and confirm email TLS failure reporting is properly configured.

Check your domain against the Google/Yahoo and Microsoft bulk-sender requirements: SPF, DKIM, DMARC and the behavioral rules, with exact DNS fixes.

Build a correct SPF record: pick your email services, add your own servers, choose the failure policy, and copy the finished TXT record.

Generate a correct DMARC record with plain-English guidance: policy, reporting address, rollout percentage and alignment options.

Upload a DMARC aggregate report (.xml, .gz or .zip) and read it as a clear table: senders, volumes, SPF/DKIM results and dispositions.

Enter any IP address to instantly find its geographic location, ISP, hostname, and organization. Our IP lookup tool provides accurate geolocation data worldw...

Process multiple IP addresses in a single lookup. Get geolocation, ISP, and organization data for up to 100 IPs at once with our free bulk IP lookup tool.

Find your current location instantly. Get exact GPS coordinates with one click, see your position on a map, and compare it with your IP-based city-level location.

Instantly see your public IP address and geographic location. Our tool shows your city, region, country, ISP, and exact coordinates on an interactive map.

See any IP address pinpointed on an interactive map. Get comprehensive geolocation data including exact coordinates, timezone, and network details.

Plot multiple IP addresses on an interactive map to compare locations. Advanced features include layer controls, clustering, and detailed popups.

Track any IP address to find its geographic location and network details. Ideal for security investigations, fraud prevention, and network troubleshooting.

Enter a CIDR block or IP range to calculate all addresses in the range. Get network address, broadcast address, usable hosts, and subnet details.

Calculate subnetting details for any IP address and mask. Get network address, broadcast address, usable host range, and wildcard mask instantly.

Check if an IP address is valid and properly formatted. Our validator supports both IPv4 and IPv6 addresses and identifies common format errors.

Convert between IPv4 and IPv6 address formats. Generate IPv4-mapped, IPv4-compatible, and 6to4 IPv6 addresses with our free conversion tool.

Determine if an IP address belongs to a reserved or private range. Identify RFC-defined special addresses including private, loopback, and link-local.

Calculate any CIDR block to get subnet mask, IP range, network address, broadcast address, and total usable hosts. Essential for network planning.

One box for every lookup: enter a domain, IP, email, URL or ASN and jump straight to DNS, WHOIS, SSL, blacklist, email-auth and security checks.

Ping any hostname or IP address to verify connectivity and measure round-trip time. Essential for diagnosing network issues and checking server availability.

Trace the route packets take to reach any destination. See every hop, identify bottlenecks, and diagnose routing problems with our visual traceroute tool.

Scan any host to discover open ports and identify running services. Essential for security audits, firewall testing, and network troubleshooting.

Discover the optimal MTU size for any network path. Avoid fragmentation, reduce overhead, and optimize network performance with accurate MTU detection.

See network latency to locations around the world displayed on an interactive heatmap. Identify high-latency regions and optimize your network strategy.

Fingerprint remote hosts to identify running services, operating systems, and software versions. Useful for security assessments and network reconnaissance.

Test your internet connection to measure download speed, upload speed, ping, and jitter. Get accurate results and compare against your ISP's promised speeds.

Look up any MAC address to identify its manufacturer and device vendor. Our OUI lookup queries the IEEE registry to reveal hardware maker details instantly.

Generate random, valid MAC addresses (locally-administered or vendor-prefixed) in bulk and any format. A free MAC address generator for testing and labs.

Free IPv6 toolkit: compress and expand addresses (RFC 5952), build ip6.arpa reverse DNS, convert to integer, calculate CIDR blocks, and generate Global, ULA & Link-Local addresses.

Test any URL to see its redirect chain and HTTP status codes. Identify redirect types (301, 302, 307), view headers, and diagnose redirect issues.

Visualize the complete redirect chain for any URL. See every hop, status code, redirect type, response headers, and timing in an easy-to-understand format.

Compare redirect chains for multiple URLs side by side. Interactive visualizations, aggregate metrics, and export capabilities for SEO and migration audits.

Check any website's SSL/TLS certificate. View expiration date, issuer, certificate chain, supported protocols, and get a security grade with recommendations.

Analyze SSL/TLS configuration in depth. Check supported protocols, cipher suites, certificate chain validity, and scan for known vulnerabilities.

Check any IP address to determine if it's using a VPN, proxy server, or Tor network. Essential for fraud prevention and security verification.

Process multiple IP addresses to detect VPN, proxy, and Tor usage in bulk. Upload a list or paste IPs to check them all simultaneously.

Determine if an IP address is connecting through a proxy server. Identify HTTP proxies, SOCKS proxies, and web anonymizers for security analysis.

Check any IP address against 100+ spam blacklists and security databases. Identify if your IP is flagged and get guidance for delisting.

Aggregate IP reputation data from multiple threat intelligence sources. Get comprehensive risk scores, abuse reports, and security recommendations.

Generate strong, random passwords instantly. Customize length, include uppercase, lowercase, numbers, and symbols. All passwords generated locally for security.

Test how strong your password is. Get detailed analysis including entropy score, crack time estimation, and actionable recommendations for improvement.

Check whether your VPN or proxy is leaking DNS queries that reveal your true location and ISP. Our DNS leak test queries multiple resolvers and highlights an...

Detect whether your browser is leaking your real IP address through the WebRTC API, which can bypass VPN tunnels. Our test reveals all local and public IPs r...

Check any URL's HTTP security headers for misconfigurations. Verify CSP, HSTS, X-Frame-Options, and 10+ other headers with actionable fix recommendations.

Detect AI crawler and bot user agents. Check whether a user agent belongs to GPTBot, ClaudeBot, Googlebot, or other automated agents and crawlers.