dnscache.exe

Windows DNS Client Cache Service (DNS Client)

CPU Usage

N/A

Memory

N/A

Location

N/A

Publisher

N/A

Summary

dnscache.exe is a legitimate Windows DNS Client Cache Service component. Verify its integrity if you suspect infection, and avoid disabling it without understanding impact.

Risk Level

Low under normal operation; moderate if the file is counterfeit or relocated.

Support Contact

Microsoft Support or IT administrator for enterprise environments.

Recommended Actions

Keep Windows updated, run periodic scans, verify file signatures, and only disable the DNS Client if required for troubleshooting.

What is dnscache.exe?

dnscache.exe is the Windows DNS Client Cache Service component. It runs in the background, typically hosted by svchost, and stores recent DNS results locally to speed up domain name lookups for applications. It also manages TTL-based eviction and cache refresh behavior.

dnscache.exe maintains a local DNS cache by interfacing with the Windows DNS resolver. It serves cached records when valid, forwards unresolved queries to recursive servers, and updates the cache with fresh results to balance speed with accuracy.

Is it Safe?

Is it a Virus?

: Check digital signature: should be signed by Microsoft Corporation.
: Confirm the DNS Client Cache module (dnscache.dll) is loaded by the DNS Client svchost container.
: Run a Defender scan to detect any malicious copies or renamed variants.
: Compare the file hash with the official Microsoft catalog (sha256) to ensure integrity.

Why is it Running?

Reasons it's running:

DNS caching accelerates lookups: Keeps recently resolved hostnames in local memory so repeated requests resolve faster without extra network trips.
Core network performance component: Part of the Windows DNS Client service architecture; essential for efficient browsing and app connectivity.
Operational across profiles: Remains active across multiple network adapters and VPNs, ensuring consistent name resolution.
Shared by many apps and services: Browsers, OS components, and background apps leverage the cached DNS data.
Managed by Windows service lifecycle: Starts with network initialization and auto-restarts; uses TTL semantics to refresh stale entries.

Can I Disable or Remove It?

Common Problems

Common Causes & Solutions

Frequently Asked Questions

What is dnscache.exe and should I trust it?

dnscache.exe is the Windows DNS Client Cache Service component that caches DNS lookups to speed up resolution. It is legitimate when located in C:\Windows\System32 and signed by Microsoft.

Is dnscache.exe a virus or malware?

Usually not. Legitimate dnscache.exe is a core Windows component. Malware may impersonate it in nonstandard paths, so verify the file path, signature, and publisher.

Can I disable dnscache.exe, and what happens if I do?

You can disable the DNS Client cache, but it may slow web browsing and increase DNS traffic. If needed, stop the DNS Client service from Services.msc and set Startup type to Disabled.

Why does dnscache.exe use CPU or memory?

Because it maintains and updates the DNS cache. Bursts can occur during network changes, heavy browsing, or when cache is corrupted—scan and flush if abnormal.

How do I fix DNS errors related to dnscache?

Try flushing DNS cache (ipconfig /flushdns), restart the DNS Client service, run sfc /scannow, and ensure DNS server settings are correct.

Where is dnscache.exe located on Windows?

Typically dnscache is part of the DNS Client service and its components reside in C:\Windows\System32 with dnscache.dll and related files accessed by svchost.exe.

Related Processes

Hosts the DNS Client Cache service and loads dnscache.dll.

Manages various networking-related services, including DNS components.

DNS resolution API used by Windows and applications.