What Is Protective DNS and How Does Secure64 Implement It?

Updated

Protective DNS (PDNS) is a security layer that inspects DNS queries in real time and blocks requests to malicious or harmful domains before a connection is ever made. Secure64 implements it through its Guard product line, which can be deployed in the cloud or on-premises and is recognized by the U.S. Government as a Protective DNS provider. This matters if you want to stop phishing, malware, and typo-squatting at the network's first lookup step rather than relying only on endpoint or perimeter tools.

How Protective DNS works

Every time a user, device, or application reaches a website or service, it first resolves a domain name to an IP address through DNS. That query is a natural checkpoint: if the domain is known to be malicious, the query can be answered with a block instead of a valid address.

Secure64 describes PDNS as analyzing domain queries in real time to detect and stop malicious activity. In practice that means:

  • Blocking harmful domains before the user's device connects to them.
  • Catching mistyped URLs that could otherwise lead to lookalike or fraudulent sites.
  • Protecting users, devices, and systems across an organization, including computers, servers, and IoT infrastructure.

Because the block happens at resolution time, the threat never reaches the user — the request simply fails or is redirected according to policy.

How Secure64 implements Protective DNS

Secure64 positions itself as a DDI (DNS, DHCP, and IP Address Management) solutions provider with 20 years of DNS experience, and states it already supports more than 1.5 billion users globally. Its Protective DNS capability is delivered through its Guard solutions, which the company says safeguard billions of users, devices, and systems daily.

Two implementation choices are stated on the site:

Deployment option What it means for you
Cloud PDNS filtering delivered as a hosted service
On-premises PDNS filtering running inside your own environment

Secure64 also states it has officially achieved Protective DNS status as recognized by the U.S. Government, and that the U.S. CISA and NSA maintain a list of pDNS vendors. If government recognition is a requirement in your evaluation, that list is the authoritative place to confirm current status.

Where Secure64 fits in a broader DNS stack

Protective DNS is one function among several in Secure64's catalog. The site lists related products including:

  • LineGuard — cyberthreat protection and content filtering
  • LineGuard Edge
  • Vizion
  • DNS Guard
  • DNS Cache, DNS Authority, DNS Signer, DNS Manager, DNS Proxy

This matters because PDNS is usually deployed alongside authoritative DNS, caching, and DNSSEC signing rather than as a standalone tool. If you already run DNS infrastructure, the relevant question is whether you want filtering integrated with your existing resolution path or added as a separate layer.

When Protective DNS is the right control

PDNS is a good fit when:

  • You want to block threats before they reach endpoints, which helps with devices you can't fully manage (IoT, guest devices, unmanaged laptops).
  • You need coverage for users who click mistyped or lookalike URLs.
  • You want a control that works regardless of whether the traffic is encrypted, since the block happens at name resolution.

It is less suited as a sole defense: PDNS filters based on domain reputation and policy, so it complements — rather than replaces — endpoint protection, email filtering, and network monitoring.

Practical next steps

  1. Confirm whether your requirement is cloud, on-premises, or hybrid — Secure64 states both cloud and on-premises options.
  2. Check the CISA/NSA pDNS vendor list if government recognition is part of your criteria.
  3. Review Secure64's own resources — the site offers case studies, white papers, datasheets, and videos — to see deployment patterns that match your environment.
  4. If you are evaluating under active threat, the site includes an "Under Attack?" entry point and a "Try Secure64" option for hands-on evaluation.

Pricing is described on the site as "predictable," but no specific figures or plan details are published in the material reviewed here, so treat cost as something to confirm directly with Secure64.