Network Tools

Network utilities for developers: analyze HTTP response headers for security issues, parse URLs into components, convert IP addresses between formats, calculate CIDR subnets, and generate CORS headers — all client-side.

5 tools — All free, no sign-up, runs entirely in your browser.

HTTP Header Analyzer

Paste HTTP response headers to analyze security (CSP, HSTS, X-Frame-Options), caching, and CORS settings.

URL Parser

Parse URLs into protocol, host, port, path, query params, and fragment with visual breakdown.

IP Address Converter

Convert IPv4 addresses between dotted decimal, binary, hexadecimal, 32-bit integer, and IPv4-mapped IPv6.

CIDR Calculator

Calculate network range, broadcast address, subnet mask, wildcard mask, and usable hosts from CIDR notation.

CORS Header Generator

Generate CORS headers for Express, nginx, Apache, and Cloudflare with method and origin controls.