Network & Web Tools
IP, subnet, DNS and browser diagnostics. · 15 tools
API Request TesterSend an HTTP request with a custom method, headers and body directly from your browser, a lightweight alternative to Postman for quick CORS-enabled API checks.Bandwidth and Download Time CalculatorEstimate download or upload time from a file size and connection speed, with support for both decimal and binary size/speed units.Browser InfoReports detailed information about your current browser and device, read directly from navigator and connection APIs, entirely locally.CIDR to IP RangeConvert a CIDR block directly to its first and last IP address and total address count.DNS LookupResolve a domain’s DNS records (A, AAAA, MX, TXT, NS, CNAME and more) using Cloudflare’s public DNS-over-HTTPS resolver.DNS Propagation CheckerCheck whether a domain’s A records agree across two major public DNS resolvers (Cloudflare, Google), helpful right after a DNS change.IP Subnet CalculatorCalculate the network address, broadcast address, usable host range and subnet mask for an IPv4 address and CIDR prefix.IP to Decimal ConverterConvert an IPv4 dotted-quad address to its single 32-bit decimal integer (and hex/binary) form, and back.IPv6 Expander and CompressorExpand an IPv6 address to its full 8-group form, or compress it to the shortest valid representation using :: zero-run collapsing.Latency TestMeasure round-trip time to several major public endpoints directly from your browser, a quick, no-install alternative to a command-line ping.MAC Address GeneratorGenerate random MAC addresses, fully random or with a realistic vendor OUI prefix, in several common formatting styles, with bulk generation.Port Number LookupSearchable reference of well-known and commonly used TCP/UDP port numbers and the services conventionally running on them.Screen Resolution CheckerSee your display’s resolution, viewport size, pixel density and colour depth live, updating automatically as you resize the window.WebRTC Leak TestCheck which local and public IP addresses WebRTC would expose to a website, a known way a VPN can leak your real IP even while connected.What Is My IPLook up your public-facing IPv4 address, which a browser has no built-in way to see on its own.
Check your public IP, calculate subnets and CIDR ranges, look up DNS records over encrypted DNS-over-HTTPS, parse URLs and inspect what your browser reveals about you.
Tools that need the internet, such as DNS lookups, say which public service they query.
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