Check network settings, inspect DNS records over HTTPS, calculate IP subnets, look up MAC addresses, convert cURL commands, and analyze HAR traffic files directly in your browser. Browse all 9 free browser-based tools below.
Query authoritative DNS records via DoH, calculate CIDR subnet ranges and IP capacities, and lookup IEEE MAC vendor OUIs.
Free DNS-over-HTTPS lookup tool. Query A, AAAA, MX, TXT, and CNAME records across Cloudflare, Google, and Quad9 with live propagation comparison.
Free IPv4 and IPv6 subnet calculator. Calculate CIDR prefixes, usable host ranges, AWS subnets, and binary netmasks with instant client-side processing.
Free MAC address & OUI lookup. Identify device manufacturers, hardware vendors, and randomized MAC addresses instantly. Fast client-side database search.
Inspect HTTP Archive (HAR) logs, convert cURL command lines into multiple programming languages, and reference HTTP status codes.
Free online HAR file analyzer. Inspect network waterfalls, response timings, headers, and domain analytics with automatic sensitive data redaction.
Convert cURL commands to JavaScript Fetch, Axios, Python Requests, Node.js, Go, PHP, Java, and Rust with shell parsing and secret redaction.
Instant HTTP status code reference. Search 1xx-5xx REST API response codes, RFC 9110 specs, cache headers, and quick code fixes. Fast client-side search.
Verify local WebRTC STUN/TURN network interfaces, inspect query string parameters, and encode/decode RFC 3986 URLs.
On-demand browser network diagnostics. Check IPv4 and IPv6 availability, WebRTC mDNS IP leaks, browser connection bandwidth, and multi-CDN latency.
Free URL parser and query parameter inspector. Inspect URL components, protocol, host, path, parameters, and hash fragments with instant live editing.
Free RFC 3986 URL encoder and decoder. Encode and decode query strings, form components, and special characters with UTF-8 support and instant output.
Browse our complete suite of 9 browser-based network utilities.
Free IPv4 and IPv6 subnet calculator. Calculate CIDR prefixes, usable host ranges, AWS subnets, and binary netmasks with instant client-side processing.
Free DNS-over-HTTPS lookup tool. Query A, AAAA, MX, TXT, and CNAME records across Cloudflare, Google, and Quad9 with live propagation comparison.
Free RFC 3986 URL encoder and decoder. Encode and decode query strings, form components, and special characters with UTF-8 support and instant output.
Free online HAR file analyzer. Inspect network waterfalls, response timings, headers, and domain analytics with automatic sensitive data redaction.
Convert cURL commands to JavaScript Fetch, Axios, Python Requests, Node.js, Go, PHP, Java, and Rust with shell parsing and secret redaction.
On-demand browser network diagnostics. Check IPv4 and IPv6 availability, WebRTC mDNS IP leaks, browser connection bandwidth, and multi-CDN latency.
Free URL parser and query parameter inspector. Inspect URL components, protocol, host, path, parameters, and hash fragments with instant live editing.
Instant HTTP status code reference. Search 1xx-5xx REST API response codes, RFC 9110 specs, cache headers, and quick code fixes. Fast client-side search.
Free MAC address & OUI lookup. Identify device manufacturers, hardware vendors, and randomized MAC addresses instantly. Fast client-side database search.
Learn how to analyze HTTP Archive (HAR) files, diagnose waterfall timing bottlenecks, inspect request headers, and isolate DNS or server-side latency drivers.
Comprehensive guide to the Domain Name System. Learn A, AAAA, CNAME, MX, and TXT record configurations, SPF/DKIM/DMARC authentication, and DNS propagation troubleshooting.
Master IPv4 subnetting, Classless Inter-Domain Routing (CIDR), subnet masks, network vs broadcast addresses, and VPC IP allocation for cloud engineers.
Complete technical guide to MAC address architecture: IEEE OUI assignments, EUI-48 vs EUI-64, multicast/local bit masks, randomized MAC addresses, and network troubleshooting.