ProtonVPN NetShield Ad Blocker Explained - Built-in DNS Filtering
Pop-ups, trackers following every step, phishing pages disguised as login forms β these annoyances consume bandwidth and attention daily. ProtonVPN built its defense inside the VPN tunnel, using a DNS filtering engine called NetShield to block threats at domain resolution.
How NetShield Works
NetShield is ProtonVPN's built-in DNS-level filtering system. When your device tries to access a domain, the client first queries ProtonVPN's DNS server, where NetShield checks the domain against a malicious-domain database. Requests matching the blacklist are dropped, so ads and trackers never load.
Unlike browser ad-blockers, NetShield works at the system level, covering ads and trackers in mobile apps and desktop software, not just browsers.
Three Filter Levels
NetShield offers three levels: off, block malicious sites only, and block malicious sites plus ads and trackers. Users switch in the client with one click. The table below compares each level.
| Filter Level | Blocks Ads | Blocks Trackers | Blocks Malware |
|---|---|---|---|
| Off | No | No | No |
| Basic | No | No | Yes |
| Full | Yes | Yes | Yes |
Measured Blocking Results
Ads and trackers often make up a large share of page weight. Official tests on major news, video and social sites show average page load times drop about 22% and mobile data usage about 18% with NetShield on. The table shows per-category results.
| Site Type | Blocked Requests | Load Time Saved |
|---|---|---|
| News portal | ~31% | 26% |
| Video platform | ~19% | 17% |
| Social platform | ~24% | 21% |
The Security Value
NetShield's more important role is blocking malicious domains. Phishing often impersonates banks or shops to steal passwords; NetShield blocks such domains before a connection forms. One real case: during a 2024 shopping promotion, NetShield blocked over one million access attempts to counterfeit domains within 24 hours, preventing massive user losses.
"NetShield unites visible cleanliness with invisible protection β the former saves data, the latter saves safety." β ProtonVPN product team
Summary
NetShield upgrades a VPN from an encrypted tunnel to a security gateway, accelerating and protecting at the DNS layer. It costs almost nothing to enable yet dramatically improves browsing and cuts phishing risk. Free download ProtonVPN and enable NetShield now.
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