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Public technical tools

Useful tools for
unruly systems.

Plan IPv4 networks, verify file checksums locally, and inspect public website security evidence—fast, focused, and available without an account.

Browse the tools Open featured planner
FEATURED TOOL / 01READY
IP SPACE172.16.0.0/16
65,536 addresses
  1. Core networks3 × /24
  2. Service ranges2 × /26
  3. Edge segments2 × /27
SUGGESTED START172.16.0.0/24

Available now

Focused tools.
Clear boundaries.

Choose the job, see exactly where it runs, and get useful output without creating an account.

01 / Network planning

IPv4 subnet planner

Browser-local

Inspect any IPv4 network or turn a mixed list of requirements into a clean, largest-first VLSM plan.

  • Single-network CIDR details
  • Variable-length allocation planning
  • Copyable and exportable results
Launch the planner

02 / File integrity

Local checksum verifier

Files stay on this device

Verify large ISOs, installers, archives, and checksum manifests locally. File contents never leave your device.

  • SHA-2 plus clearly labeled legacy checks
  • Chunked large-file and batch processing
  • Manifest verification and compatible exports
Open the verifier

03 / Public website security

Website security check

Bounded Azure scan

Inspect bounded DNS, certificate, TLS, redirect, header, and cookie-attribute evidence from TechnicalEntropy’s Azure scanner.

  • Prioritized findings with supporting evidence
  • Validated and pinned public targets
  • Opt-in history stays on this device
Check a website

Built for IT work

Useful by default.
Honest about scope.

TechnicalEntropy publishes purpose-built tools with explicit processing boundaries and enough evidence to understand the result—not a vague score or an unexplained answer.

01

Start immediately

Public tools work without an account, onboarding flow, or unnecessary setup.

02

Know where work happens

Planning and file checks stay in your browser. Public website scans clearly disclose their bounded Azure requests.

03

Keep useful output

Copy, download, export, or explicitly save results when the workflow benefits from it.