Developer Tools

Subnet / CIDR Calculator

Network, mask, broadcast, host range and counts for IPv4 and IPv6.

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IP Range → CIDR

Smallest set of CIDR blocks covering a start–end range.

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IPv4 / IPv6 Converter

Integer, hex, binary, IPv4-mapped, 6to4, NAT64 and reverse-DNS forms.

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URL Parser

Splits a URL into scheme, host, port, path, query parameters and fragment.

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Hostname & IDN Parser

Labels, registrable domain, TLD and punycode ↔ Unicode conversion.

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Base64 Encoder / Decoder

Standard and URL-safe Base64.

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URL Encoder / Decoder

Percent-encode or decode text.

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JWT Decoder

Decodes header and payload and explains the claims. The signature is NOT verified.

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Timestamp Converter

Unix seconds/milliseconds ↔ ISO 8601 / human dates in any time zone.

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HTTP Status Code Lookup

What every HTTP status code means, and what it means for SEO.

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JSON Formatter & Validator

Validates JSON, shows the error position, pretty-prints or minifies.

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Regex Tester

Test JavaScript regular expressions live in your browser - nothing is sent to the server.

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