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# How to test and change DNS with eclean DNS Optimizer

DNS Optimizer helps you compare DNS providers and apply a different DNS configuration from inside eclean. DNS does not increase your raw internet speed, but a faster or filtered provider can make websites begin loading sooner and can add provider-level filtering for ads, malware, or adult content.

| Reset DNS returns the adapter to automatic DHCP behavior. It does not reset every network setting in Windows.

### How to test and change your DNS provider

1. **Open DNS Optimizer:** Go to **Booster > DNS Optimizer**.
2. **Review your current DNS:** Check the current DNS card first so you know what eclean sees before you change anything.
3. **Choose a filter:** Use **All**, **Malware**, **Adult**, or **Ads** if you only want to compare providers with a specific filtering focus.
4. **Run a test:** Click **Test all** to compare every provider, or select one provider and click **Test selected**.
5. **Apply your choice:** Select the provider you want and click **Apply changes**.
6. **Test normal browsing:** Open a few websites and any work, school, VPN, or game services you rely on.
7. **Reset if needed:** If browsing or internal network names stop working, click **Reset DNS** and confirm the reset.

### When not to change DNS

* Avoid custom DNS on work, school, hotel, captive portal, parental-control, or VPN-managed networks unless you know custom DNS servers will work.
* A low latency result only measures DNS lookup delay. It does not fix weak Wi-Fi, packet loss, or a slow internet plan.
* If the test is still running, stay on the page. eclean blocks navigation during DNS latency testing so the test can finish safely.

### Technical deep dive

DNS Optimizer works with curated DNS server records. A record can include a provider name, primary and secondary IP addresses, supported protocols, filtering labels, and optional encrypted DNS endpoints for DNS over HTTPS or DNS over TLS. eclean validates the IP addresses and encrypted endpoint fields before applying a provider.

When you apply a DNS provider, eclean records the DNS servers Windows reported before the change, applies the selected provider, invalidates the current-DNS cache, refreshes the current DNS values, and writes the action to Booster History. **Reset DNS** returns DNS to automatic DHCP behavior; it does not reset Wi-Fi profiles, adapters, VPN software, proxy settings, firewall rules, or the whole TCP/IP stack.