Network Tools
18 toolsDNS lookup, IP tools, speed tests, SSL checkers, and web utilities.
Verify SSL/TLS certificates, check expiration dates, and validate chain trust.
Check HTTP security headers for web applications and get improvement recommendations.
Check if an IP is listed on Spamhaus, SpamCop, Barracuda, SORBS, and 8 more DNSBL blocklists.
Trace email routing, extract sender IPs with geolocation, and verify SPF/DKIM/DMARC authentication.
Check if your VPN is leaking your real IP address through DNS or WebRTC side channels.
Scan DNS records for security configurations including SPF, DKIM, and DMARC.
Calculate IPv4 subnet details including network address, broadcast, subnet mask, wildcard, and usable host range from CIDR notation.
Look up domain registration details including registrar, creation date, expiry, nameservers, and DNSSEC status.
Interactive reference for common TCP/UDP network ports with security ratings, filtering, and detailed notes.
Check if your URL is accessible to 24 search engine crawlers, AI bots, and social media bots. Analyze robots.txt rules and HTTP responses.
Find location and details of any IP address.
Test your internet download and upload speeds.
Perform DNS lookups to find A, AAAA, MX, CNAME, NS, TXT, SOA records for any domain.
Encode and decode URLs for safe transmission and parsing.
Detect your screen resolution, viewport size, and device info.
Search HTTP status codes by number or description. Get explanations, use cases, and solutions for every status code.
Search MIME types by file extension or content type. Find the right MIME type for any file format.
About Network Tools
FindUtils provides 14 free network diagnostic and web infrastructure tools. Look up DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA), check IP addresses with geolocation data, test internet connection speed, verify SSL certificate validity and expiry dates, query WHOIS registration data, calculate IPv4 and IPv6 subnets, and analyze HTTP security headers against OWASP best practices. All 14 tools run directly in your browser with no software to install, making them accessible from any device.
Frequently Asked Questions
Are these network tools accurate?
Yes. FindUtils network tools query live, authoritative data sources for real-time results. The DNS lookup tool queries actual DNS resolvers to return current A, AAAA, CNAME, MX, TXT, NS, and SOA records. The SSL certificate checker verifies real certificates directly from the target server, showing expiry dates, issuer information, and certificate chain details. The WHOIS lookup queries official WHOIS databases maintained by domain registrars and regional internet registries. The security headers analyzer checks actual HTTP response headers against current OWASP recommendations. The speed test measures your real connection bandwidth. Results reflect the current live state of the internet at the time of your query.
Do I need technical knowledge?
FindUtils network tools are designed for users at all experience levels, from beginners to IT professionals. Basic tools like the internet speed test and IP address lookup require no technical knowledge. Simply click a button and get your results with clear, plain-language explanations. More advanced tools like the subnet calculator, DNS lookup, and security headers analyzer are designed for IT professionals, network administrators, and web developers, but they include explanatory text alongside results so less experienced users can still understand the output. Each tool provides context for its results, explaining what values mean, what is normal, and what might indicate a problem. Tooltips and help text guide you through unfamiliar concepts.
Is my data private when using these tools?
Privacy varies by tool type depending on whether the tool needs to contact external servers. Tools that process local data, like the subnet calculator and IP address parser, run entirely in your browser with no network requests. Tools that query external data sources necessarily send minimal information. The DNS lookup sends only the domain name being queried to DNS resolvers. The SSL checker connects to the target server to retrieve its certificate. The WHOIS lookup sends the domain name to WHOIS servers. The speed test measures your connection by downloading and uploading test data. In all cases, only the minimum necessary information is transmitted. FindUtils does not log, store, or track your queries on any server.
Can I use these for troubleshooting?
Absolutely. FindUtils network tools are commonly used by web developers, system administrators, and IT professionals for diagnosing connectivity and infrastructure issues. The DNS lookup helps identify propagation problems, misconfigured records, and mail delivery issues by showing all record types for a domain. The SSL certificate checker is essential for monitoring certificate expiry dates and identifying chain-of-trust problems that cause browser warnings. The security headers analyzer identifies missing or misconfigured HTTP security headers that could leave websites vulnerable to XSS, clickjacking, and other attacks. The speed test helps diagnose bandwidth issues. The WHOIS lookup is useful for investigating domain ownership and registration status.