network-tools/public/README.md

Network Tools

Calculate and construct network values locally in the browser.

Network Tools is a standalone local-first application in the add·ideas Toolbox. Inputs are processed in the browser and are not uploaded.

Current scope

• IPv4 and IPv6 parsing, canonicalisation, prefix ranges and IPv4 broadcast calculation
• Largest-first IPv4 VLSM planning with conventional network/broadcast reservations, alignment and atomic fit failures
• URL resolution, component/query inspection and password-redacted display without requesting the URL
• Bounded A, AAAA, CNAME, MX, SRV, CAA and TXT zone-record construction
• Inert, bounded zone-file parsing with $ORIGIN, $TTL, inherited owners, multiline records, common RDATA validation and explicit syntax-only coverage for unknown types; $INCLUDE is never followed
• Bounded response-header security analysis covering CSP, HSTS, cookies, CORS, framing, content sniffing, referrer and cross-origin policies
• CSP parsing/diagnostics and explicit conservative CSP construction
• A compact offline extension/MIME reference

The application treats pasted values as untrusted, applies explicit length and numeric limits, and makes no DNS, URL or HTTP request. See docs/ARCHITECTURE.md and docs/PRIVACY-SECURITY.md.

Development

Requires Node.js 22 and npm 11.

npm ci
npm run check
npm run test:browser

Release

npm run release:artifact creates a deterministic release/network-tools-0.2.0.zip and checksum sidecar.

Licence

GPL-3.0-or-later. Runtime dependencies retain their own licences; see THIRD_PARTY_NOTICES.md.