# Network Tools - 16 Free Online Tools > Network diagnostics and lookup tools. Check DNS, WHOIS, SSL, IP, email, package tracking, proxy detection, and internet speed. All in your browser. Browse all 16 free online network tools on DevTools Hub. URL: https://tools.scoreroute.com/tools/network/ ## Frequently Asked Questions **What network diagnostics are available?** Sixteen tools: DNS lookup, WHOIS, IP address lookup, SSL certificate checker, subnet calculator, email verifier, package tracker, proxy checker, speed test, CORS header generator, HTTP status checker, website down checker, email auth (SPF/DKIM/DMARC), URL metadata extractor, user-agent parser, domain age checker, and API tester. **Do the DNS, WHOIS, and SSL lookups expose my IP or query targets to a third party?** Yes, those three tools must contact public authoritative servers (DNS resolvers, WHOIS servers, certificate transparency logs) to do their job, so the domain or IP you query is visible to those services the same way a terminal `dig` or `whois` command would be. **Is the speed test accurate?** The speed test downloads and uploads a small payload from a Cloudflare edge server to estimate throughput. Results are influenced by your network conditions, Wi-Fi signal, and VPN; for SLA-grade measurements use a wired test against a known reference server. **Are these tools safe for production network troubleshooting?** Yes. The 16 network tools use standard read-only protocols (DNS, WHOIS, HTTPS HEAD/GET, certificate inspection) and do not modify remote systems. They are appropriate for production reconnaissance and incident triage. ## Tools in this category - [CORS Header Generator - Access-Control-Allow-Origin Headers](https://tools.scoreroute.com/tools/cors-header-generator/): Free CORS header generator. Configure allowed origins, methods, headers, credentials. Generate Nginx, Apache, Express, Flask, Cloudflare Workers snippets. Preflight simulation. AI gets CORS wrong - we don't. - [DNS & WHOIS Lookup - Check Domain Records](https://tools.scoreroute.com/tools/dns-lookup/): Free DNS lookup and WHOIS checker. Query DNS records (A, AAAA, MX, NS, SOA, TXT) and domain registration info instantly. No signup required. - [Domain Age Checker - Free WHOIS Domain Age Lookup](https://tools.scoreroute.com/tools/domain-age-checker/): Free domain age checker. Check how old any domain is with instant WHOIS lookup. See creation date, age in years/months/days, expiry date, registrar, and nameservers. No signup. AI cannot check real WHOIS records - we do. - [Email Authentication Checker - SPF DKIM DMARC Check](https://tools.scoreroute.com/tools/email-auth-checker/): Free email authentication checker. Check SPF, DKIM, and DMARC records for any domain. Fix email deliverability. AI cannot check real DNS records - we do. - [Email Verifier - Verify Email Addresses Instantly](https://tools.scoreroute.com/tools/email-verifier/): Free email verifier. Check if email addresses are valid and can receive messages. Detect disposable emails and SMTP issues. No signup required. - [Free Package Tracker - Track Any Carrier](https://tools.scoreroute.com/tools/package-tracker/): Free universal package tracker. Enter any tracking number and automatically detect the carrier. Track USPS, UPS, FedEx, DHL, Amazon, and more. No signup. - [Free Speed Test - Internet Speed Checker](https://tools.scoreroute.com/tools/speed-test/): Free internet speed test. Check your download speed, upload speed, and latency instantly in your browser. No software install needed. - [HTTP Status & Header Checker - Response Code Security Audit](https://tools.scoreroute.com/tools/http-status-checker/): Free HTTP status checker. Check response codes, security headers, redirect chain, response time. AI cannot check real HTTP headers - we do. - [IP Address Lookup - Find Your IP Address](https://tools.scoreroute.com/tools/ip-address-lookup/): Free IP address lookup tool. Find your public IP, location, ISP, and geolocation data instantly. No signup required. - [Is It Down? - Website Down Checker](https://tools.scoreroute.com/tools/website-down-checker/): Free website down checker. Check if any site is down for everyone or just you. Real-time HTTP status, response time. No signup. AI cannot check real-time website status - we do. - [Proxy Checker - Free IP Proxy Detection Tool](https://tools.scoreroute.com/tools/proxy-checker/): Free online proxy checker. Detect if an IP address is a proxy, VPN, or Tor exit node. Check IP geolocation, WHOIS, and open proxy ports. - [REST API Tester - Free Online HTTP Client & API Tester](https://tools.scoreroute.com/tools/api-tester/): Free online REST API tester and HTTP client. Send GET, POST, PUT, PATCH, DELETE requests with custom headers. View real response status, timing, headers, and body. No signup, 100% private. AI cannot make HTTP requests - we do. - [SSL Certificate Checker - Test Website Security](https://tools.scoreroute.com/tools/ssl-checker/): Free SSL checker. Scan any website for TLS security and certificate validity. Get grade A+ to F. No signup. AI cannot test real SSL certificates. - [Subnet Calculator - IPv4 IPv6 CIDR VLSM Supernetting](https://tools.scoreroute.com/tools/subnet-calculator/): Free subnet calculator for IPv4 and IPv6. Bit-exact CIDR, VLSM, supernetting, overlap detection. No signup. AI cannot reliably compute subnets - we do. - [URL Metadata Extractor - Link Preview & Meta Tag Analyzer](https://tools.scoreroute.com/tools/url-metadata-extractor/): Free URL metadata extractor. Extract OG tags, Twitter cards, JSON-LD, and SEO meta from any URL. See link previews before sharing. No signup. - [User Agent Parser - Browser OS Device Detection Online](https://tools.scoreroute.com/tools/user-agent-parser/): Free online User Agent parser. Parse any UA string to identify browser, OS, device, and bot. Detect Googlebot, GPTBot. 100% private, no upload. ## About DevTools Hub DevTools Hub is a free collection of 150+ browser-based developer tools. No signup, no tracking, all processing happens in your browser. See [llms.txt](https://tools.scoreroute.com/llms.txt) for the full tool catalog.