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Test regex patterns, parse user agents, explore HTTP status codes, and debug web infrastructure.
22 tools
Test and evaluate regular expressions in real-time natively in your browser.
Generate practical regex patterns for common validation and parsing tasks.
Build, parse, and understand cron schedules easily.
Decode raw User-Agent strings to identify browser, engine, OS, CPU, and device details.
Visualize the next execution times for any cron expression.
Searchable reference for all HTTP status codes with descriptions.
Interactive Unix file permission calculator. Toggle permissions or enter octal directly.
Calculate network, broadcast, host ranges, and masks from IPv4 CIDR blocks.
Lookup RDAP/WHOIS records to inspect registrar, lifecycle dates, and name servers.
Lookup IPv4/IPv6 network ownership and geo metadata including ASN and ISP.
Inspect TLS certificate chains, handshake metadata, and weak algorithm risks.
Trace full redirect hops, final landing URL, and canonical target.
Run live DNS-over-HTTPS lookups and inspect real resolver answers.
Parse URLs into components and interactively edit query parameters.
Decode PEM-encoded X.509 certificates and inspect all details locally.
Build HTTP requests visually and generate cURL, JavaScript fetch, or Python code.
Convert cURL commands to JavaScript, Python, Go, PHP, or Rust code.
Parse and test robots.txt rules against URLs to check crawler access.
Parse Content Security Policy headers and analyze for security issues.
Compare HTTP headers side by side and highlight differences.
Analyze security headers with pass/warn/fail scoring and remediation guidance.
Paste an OpenAPI spec and generate mock responses for each endpoint.