Tools

Developer & Network Utilities

Calculators, converters and lookups — no tracking, no sign-up.

IP & network lookups

Convert, classify and query anything address-related — all in the browser.

Formats, class, scope and subnet math for any IPv4 address.

Subnet math: network, mask, host range and counts.

Convert an IPv4 address to decimal, hex and binary.

Expand and compress IPv6 addresses.

Query A/AAAA/MX/TXT/NS records over DNS-over-HTTPS.

Domain and IP registration lookup via RDAP.

Resolve a hardware vendor from a MAC OUI prefix.

Everything this browser exposes about itself, fingerprinting surfaces included.

User agent, platform, screen, locale, fingerprinting surfaces and capabilities.

Encode, decode and inspect tokens without sending them anywhere.

Encode & decode text, with a URL-safe variant.

Inspect the header and payload of a JSON Web Token.

Random identifiers from the browser CSPRNG.

Generate UUID v4 and URL-safe NanoID strings.

Look up ports and services, and check when things run.

Validate and explain cron schedule expressions.

Look up well-known TCP/UDP port numbers and services.