# Network & HTTP Tools

> HTTP requests and status codes, WebSocket, curl to code, URL parsing, subnet and IPv6 calculators, security headers and certificates.

- URL: https://qilingtools.com/en/tags/network
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

## Tools (17)

- [URL Encode/Decode](https://qilingtools.com/en/url-encode): Free online URL encoder and decoder with encodeURIComponent and encodeURI modes. Escapes Chinese, spaces and special characters. Real-time and local, no upload.
- [Subnet Calculator](https://qilingtools.com/en/cidr): Free online IPv4 subnet calculator: enter 192.168.1.10/24 for the network, broadcast, host range and count, wildcard mask, binary view and a prefix table.
- [HTTP Status Codes](https://qilingtools.com/en/http-status): Complete HTTP status code reference: every 1xx–5xx code with its name and a plain-language explanation, searchable by code, name or keyword.
- [URL Parser](https://qilingtools.com/en/url-parse): Free online URL parser: split a link into protocol, host, port, path and hash, edit decoded query parameters in a table, rebuild the URL live, export as JSON.
- [User-Agent Parser](https://qilingtools.com/en/user-agent): Free online User-Agent parser: browser and version, rendering engine, OS, device type and model, and bot detection for Googlebot, Bingbot and GPTBot.
- [curl Converter](https://qilingtools.com/en/curl-convert): Free online curl converter: paste a curl command and get fetch, axios, Node, Python requests, Go, PHP or Java code, plus a parsed view of the request.
- [WebSocket Tester](https://qilingtools.com/en/websocket-test): Free online WebSocket client: connect to ws:// or wss://, send text, JSON or binary messages, read a filterable log, auto-reconnect, plus an SSE tester.
- [HTTP Request Tester](https://qilingtools.com/en/http-request): Free online HTTP client: send GET, POST, PUT or DELETE with params, headers, JSON, form or file bodies and auth, then inspect status, timing, headers and body.
- [Nginx Config Generator](https://qilingtools.com/en/nginx-config): Generate Nginx configs for static sites, SPAs, reverse proxies, WebSocket and PHP-FPM with HTTPS, HTTP/2, gzip, caching, security headers and rate limits.
- [SSL Certificate Decoder](https://qilingtools.com/en/cert-decoder): Decode SSL/TLS certificates online: subject, issuer, days to expiry, SANs, key usage, OCSP/CRL, SCTs and SHA-256 fingerprints, with chain and signature checks.
- [robots.txt & Sitemap Generator](https://qilingtools.com/en/robots-sitemap): Build robots.txt (block GPTBot, ClaudeBot and other AI bots in one click), test URLs with Google’s rules, and generate or validate sitemap.xml.
- [IPv6 Calculator](https://qilingtools.com/en/ipv6): Free IPv6 toolkit: RFC 5952 compress/expand, prefix ranges, paged subnetting, address types (Teredo, 6to4, NAT64), EUI-64, ip6.arpa and random ULA.
- [OpenAPI Viewer](https://qilingtools.com/en/openapi-viewer): View OpenAPI 3.x and Swagger 2.0 (JSON/YAML) online: tag-grouped endpoints, search, $ref schema trees, example JSON, curl/fetch snippets and HTML export.
- [HTTP Security Headers Checker](https://qilingtools.com/en/security-headers): Paste raw HTTP response headers to get an A+ to F grade with checks for HSTS, CSP, X-Frame-Options, cookies, CORS and more, plus fixes and a CSP builder.
- [GraphQL Formatter](https://qilingtools.com/en/graphql-format): Format, minify and validate GraphQL queries and SDL: syntax errors with line and column, unused variables and fragments, curl and fetch snippets, a type graph.
- [MIME types](https://qilingtools.com/en/mime-types): Free MIME type lookup: search 80+ common formats by extension or type, copy the Content-Type with one click, with notes on charset and download headers.
- [Port numbers](https://qilingtools.com/en/port-numbers): Free port number lookup: search 60+ common ports by number, service or purpose, see which must never face the internet, and find what is using one locally.