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Windows’ built-in DNS Client cache gives you a dependency-free place to start investigating unexpected name resolutions. Use Get-DnsClientCache to inspect cached records, compare suspicious answers with a trusted DNS view, and preserve the details before changing anything. A mismatch is a lead to investigate—not proof of poisoning.
What a Windows cache check can—and cannot—tell you
Windows checks its local DNS Client cache before querying a DNS server. That cache can contain records learned from earlier DNS responses as well as Hosts-file mappings loaded when the DNS Client service starts; records are subject to their time to live (TTL). Microsoft describes this behavior in its DNS queries and lookups documentation.
A cache inspection shows what the client currently has available for a name. It does not, on its own, establish how a record got there, whether an answer was forged, or whether the record is still appropriate for the network. An unexpected address can also reflect ordinary DNS changes, caching, or environment-specific policy.
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Open PowerShell and query the DNS Client cache with the Microsoft-documented Get-DnsClientCache cmdlet. The DnsClient PowerShell module reference documents this cmdlet and Clear-DnsClientCache.
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- Record the incident context. Note the affected hostname and the time the unexpected result appeared. If you know the application or action that triggered the lookup, record that too.
- Inspect cached records. Run
Get-DnsClientCacheand identify the relevant name, record type, data or address, and TTL where available. Save the output and note when you collected it. - Record the resolver. Capture which DNS resolver the system is configured to use at the time of the check. Without that context, an answer cannot be meaningfully compared with another resolver’s response.
- Preserve evidence before changing state. Keep the cache output and incident notes before clearing the cache or making configuration changes.
This is a practical evidence-gathering workflow, not a validated end-to-end detection algorithm. The documented commands expose cache operations; they do not label an entry as poisoned.
Compare a suspicious answer with a trusted DNS view
Compare the cached answer with a resolution obtained through an independent, trusted path appropriate to your organization—for example, an approved resolver or an authoritative operational record. Record the queried name, record type, answer, TTL where available, time, and the resolver behind each result.
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Interpret a difference as a reason to investigate, not a verdict. Different answers may be legitimate when a network uses split-horizon DNS, resolver policy, or recently changed records; caching can also account for variation. Determine whether the comparison paths are expected to return the same view before escalating on the basis of a mismatch.
- Matching answers: This does not rule out every DNS issue; it only means the compared views agreed at the times and through the paths recorded.
- Different answers: Check the resolver identities, timestamps, record type, TTL, and network policy before attributing the difference to poisoning.
- Insufficient client evidence: If you administer the DNS Server role, consider scoped server-side diagnostics to obtain additional telemetry.
When server-side DNS logging is needed
A Windows client cache check is not a view of all DNS traffic or server activity. Microsoft documents separate DNS Server audit, analytic, and packet-level diagnostic logging in its guide to DNS logging and diagnostics. These options require access to the DNS Server environment; they are not evidence supplied by a client-only check.
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Server diagnostics should be scoped and time-bounded. Microsoft warns that analytic logging can affect performance at high query rates and that debug log sizing matters. Its example estimates about 5% performance degradation at 100,000 queries per second on modern hardware, with no apparent impact at 50,000 queries per second or lower. Those figures describe Microsoft’s example for DNS Server analytic logging—not an endpoint detector benchmark, a guarantee, or a measure of detection accuracy.
Microsoft’s DNS Server diagnostic documentation includes audit event 515 for record creation and event 516 for record deletion. Those events concern server record changes; they do not, by themselves, prove that a forged recursive response reached a Windows client.
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Read DNS telemetry carefully
DNS telemetry can be difficult to interpret because request and response segments are not directly linked in every collected dataset, and several logged segments can create duplicate records. Microsoft Defender’s DNS event collection guidance notes that the response to the client is especially useful because it can contain the queried domain, lookup result, and client IP. Its example filters to response events; normalize or filter collected data before interpreting event counts.
Keep the scope of each evidence source clear: client cache entries, DNS Server configuration-change events, and DNS response telemetry answer different questions. None should be presented as proof of poisoning without corroboration.
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Should you clear the DNS cache?
Clearing the cache can help with troubleshooting or support a controlled recheck, but it is not a detection method. Microsoft documents Clear-DnsClientCache for clearing the DNS Client cache; the act of flushing does not show that an attack occurred or prevent a malicious answer from being obtained again.
If you decide a flush is necessary, preserve the current cache evidence first, then record when you cleared it and what happened during the subsequent resolution check. Do not treat the flush itself as confirmation of an incident.
How DNSSEC and encrypted DNS fit in
DNSSEC validation and DNS encryption address different security properties from local cache monitoring. NIST’s Secure Domain Name System (DNS) Deployment Guide, SP 800-81r3, published March 19, 2026, covers DNSSEC’s role in the integrity and authenticity of DNS information, and recursive DNS confidentiality for client queries.
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A cache monitor is an operational signal: it helps an administrator inspect what a Windows client has cached. DNSSEC and recursive DNS confidentiality are security controls with distinct purposes; neither should be conflated with a cache inspection, and a local monitor is not a substitute for them.
Quick Recap
A practical escalation checklist
- Preserve the hostname, record type, answer, TTL where available, resolver, and collection time.
- Compare the result with an appropriate trusted DNS view and record that resolver and time as well.
- Investigate legitimate explanations such as split-horizon views, policy, caching, or record changes before calling a mismatch poisoning.
- If client evidence is not enough and you administer the DNS Server role, use scoped diagnostics while monitoring performance and storage.
- Keep cache clearing separate from detection: preserve evidence first and document any flush and controlled recheck.
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