Updated 25 October 2026
Planning and learning aids
Results help with investigation, comparison and learning. Validate production network changes, capacity plans, backups, security decisions and recovery procedures against actual systems, current vendor documentation and your organisation’s change process.
Infrastructure assumptions
RAID capacity excludes platform overhead and hot spares unless you account for them in the inputs. RAID is not a backup. VM allocation ceilings do not demonstrate workload performance or cluster failover capacity. Backup estimates do not prove that a restore chain works. Availability models depend on the stated dependency and independence assumptions.
Security checks are limited
JWT and certificate decoding do not validate signatures, issuer trust, hostname matching or revocation. Hashing is not encryption. An HMAC comparison checks the supplied message and secret; it does not by itself establish a trusted sender or prevent replay. Generated credentials must still be handled securely.
DNS and mail checks are offline
DNS, SPF, DKIM, DMARC and mail-policy tools use the values you supply. They do not query authoritative DNS, prove domain ownership, inspect live mail flow or guarantee delivery. Check deployed records and actual message evidence after a change.
Recommendations and AI estimates
Decision flows offer starting patterns with trade-offs. No architecture fits every workload. Token counts and costs are estimates based on supplied ratios and prices, and no language model generates the site’s recommendations.
Professional judgement
The site provides no engineering certification, security attestation, legal advice or financial advice. Use qualified review where the task or consequences require it. Mandatory legal rights remain unaffected.
Investigating unexpected output
Check a synthetic example against the stated formula, input units and supporting references. A local calculation or syntax check is one part of an operational investigation.