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開発者・ネットワークツール

14 free utilities for developers and network administrators. No account, no rate limits, nothing stored. Encoding, hashing and IP maths run entirely in your browser; network lookups query public infrastructure directly.

エンコード

Convert text between formats. Runs entirely in your browser.

URL EncoderPercent-encode and decode URL stringsBase64 EncoderConvert to and from Base64, Unicode safeHTML EntitiesEscape and unescape HTML special charactersJSON FormatterPretty-print, minify and validate JSON

セキュリティ

Hashes, passwords and transport security inspection.

Hash GeneratorMD5, SHA-1, SHA-256, SHA-384 and SHA-512Password GeneratorCryptographically secure random passwordsSSL CheckerInspect certificates, chains and expiryHTTP HeadersAudit security headers and redirect chains

ネットワーク

Query the public DNS and registry infrastructure.

DNS LookupQuery A, AAAA, MX, TXT, NS and moreWHOIS LookupRegistration data over RDAPWebsite StatusAvailability and response-time checksEmail ValidatorSyntax, MX, SPF and DMARC verification

IP ツール

Address arithmetic, conversion and subnetting.

IP ConverterDecimal, hex, binary and IPv6 conversionSubnet CalculatorCIDR ranges, masks and subnet splitting