See the path from name to response.
DNS records, certificate identity, TLS negotiation, HTTP behavior and security headers in one readable diagnostic.
Tools Lab / Practical engineering utilities
Inspect the systems
behind the interface.
Tools Lab technical content
Three focused tools for making sense of domains, networks and the web. Built on browser computation and open standards, running on bounded local infrastructure, with no paid APIs and no black-box scoring.
Design address space that fits.
CIDR calculations, binary boundaries, subnet splitting and aligned VLSM allocation, all computed privately right in your browser.
Read what a crawler sees.
Technical metadata, canonical signals, robots policy, sitemaps and structured data with evidence instead of an invented SEO score.
OPERATING PRINCIPLES
Useful signals. Narrow capabilities.
The Network Architect never sends input to the server. The two public inspectors validate DNS destinations, block private ranges, pin connections to validated public addresses, and limit redirects and response size. They don't retain scan history either.
References / Verified sources
Tooling & standards.
The open projects and standards behind the diagnostic methods this lab relies on.
SOURCES / 06