Terms of Service
Last updated: October 2026
By using DiagnoStack, you agree to the terms below. This is a general-purpose terms document, not legal advice tailored to any specific jurisdiction.
The service
DiagnoStack provides free, informational calculators, checkers, and generators for IT infrastructure work. No account is required. The service is provided "as is" for planning and reference purposes.
Acceptable use — please read this section carefully
Several tools on this site (including but not limited to the Port Checker, Network Diagnostics, Blacklist Checker, DNS Propagation Checker, DNSSEC Validator, and HTTP Error Analyzer) perform live network requests against a host, domain, or IP address you provide. By using these tools, you agree that:
- You will only run checks against domains, hosts, or IP addresses that you own, operate, or otherwise have clear authorization to test.
- You will not use this site to perform reconnaissance, scanning, or any preparatory step toward unauthorized access to a system you do not own or have permission to test.
- You will not attempt to circumvent the rate limits in place on these tools, or use automated means to submit a high volume of requests.
- You will not use this site for any illegal purpose under the laws applicable to you.
Using network scanning or reconnaissance tools against systems you don't have authorization to test can be illegal in many jurisdictions, independent of what this site's terms say — this section exists to be explicit about it, not to define the whole of your legal responsibility. DiagnoStack reserves the right to block, rate-limit, or report abuse of these tools.
No warranty
The calculators, checkers, and generators on this site are provided for informational and planning purposes only. They are not a substitute for professional judgment, testing, or advice from a qualified engineer. Pricing figures, sizing formulas, and generated configuration are estimates and starting points — verify anything security- or production-critical before relying on it. This site makes no warranty, express or implied, as to the accuracy, completeness, or fitness for a particular purpose of any tool's output.
Limitation of liability
To the maximum extent permitted by law, DiagnoStack and its operator are not liable for any damages, direct or indirect, arising from your use of this site or reliance on any tool's output, including but not limited to infrastructure misconfiguration, service outages, security incidents, or financial loss.
Affiliate links
Some pages contain affiliate/referral links to third-party products and services. DiagnoStack may earn a commission from purchases made through these links, at no extra cost to you. These third-party services are not operated by DiagnoStack, and their own terms and privacy policies apply once you leave this site.
Intellectual property
The site's design, code, and written content are the property of its operator. You're welcome to use any tool's output (generated configs, calculations, reports) for your own purposes without restriction. Bulk automated scraping or republishing of the site's content or tool interfaces themselves is not permitted.
Changes to the service or these terms
Tools may be added, changed, or removed at any time. These terms may be updated periodically; continued use of the site after a change constitutes acceptance of the updated terms.
Contact
Questions about these terms: hello@diagnostack.cloud.