DNS Filtering Built for ISP Networks

Control D gives internet service providers a cloud-based DNS filtering platform that protects subscribers from cyber threats, enforces regulatory content filtering, and turns security into a billable service. Deploy across your network in minutes. No hardware, no rack space, no CPE changes.
Subscriber Threat ProtectionBlock malware, phishing, botnets, and command-and-control domains at the DNS layer before they reach subscriber devices.
Per-Subscriber Filtering PoliciesAssign unique content filtering profiles per household, business, or subscriber tier with granular category and service-level controls.
Regulatory Content FilteringMeet government-mandated filtering requirements with category-based blocking, audit-ready query logs, and exportable compliance reports.
Billable Security Add-OnsPackage DNS filtering, parental controls, and ad blocking into tiered subscriber plans that generate recurring revenue.

What ISPs Get With Control D

Network-Wide Threat Defense
Protect your entire subscriber base from malware, phishing, botnets, and C2 domains at the DNS layer. Control D's triple-layer threat intelligence combines curated blocklists, IP-level blocking for domains resolving to known malicious IPs, and an AI-powered malware filter that catches threats traditional feeds miss.
Scale Without Bottlenecks
Control D runs on a global Anycast network built to handle millions of DNS queries per second. Queries route to the nearest healthy node automatically. No single point of failure, no capacity planning on your end.
Per-Subscriber Content Filtering
Offer households and businesses customizable filtering policies. Each subscriber gets their own profile with category-based blocking, service-level rules across 850+ apps, and optional parental controls.
Turn DNS Security Into Revenue
Package filtering tiers as billable add-ons: basic threat protection, premium parental controls, ad-free browsing, or full content filtering. Increase ARPU without increasing support burden.
Cloud-Native, API-Driven Deployment
No hardware to ship. No firmware to maintain. Point your resolvers to Control D and provision subscriber profiles through a full REST API. Integrate with your existing OSS/BSS stack.
Encrypted DNS Across All Protocols
Support DNS-over-HTTPS, DNS-over-TLS, DNS-over-QUIC, and DNS-over-HTTP/3. Give subscribers privacy from third-party snooping while maintaining your ability to enforce filtering policies.
Control D gives ISPs a single platform for subscriber protection, regulatory compliance, and revenue growth. It integrates into your existing infrastructure through DNS — no appliances, no CPE changes, no lengthy deployment cycles. Your network team keeps full control while subscribers get a safer, faster internet experience.

What Happens When ISPs Skip DNS Filtering

ISPs that skip DNS-layer protection leave their networks and subscribers exposed. Threats propagate, subscribers leave, regulators fine, and support costs climb. These are problems that get more expensive the longer they go unaddressed.
Subscriber-Targeted AttacksPhishing, malware, and botnets spread unchecked through your network. Compromised subscribers flood your support queue and erode trust in your service.
Subscriber ChurnSubscribers hit by repeated security incidents or missing filtering options switch to competitors that offer a safer experience out of the box.
Regulatory PenaltiesGovernments worldwide increasingly mandate content filtering at the ISP level. Non-compliance risks fines, license revocations, and legal action.
Wasted BandwidthMalicious traffic, ad networks, crypto-mining scripts, and botnet C2 traffic consume bandwidth that should be serving legitimate subscriber activity.

DNS Filtering Features Built for ISP Networks

DNS-Level Threat Blocking
Block malware, phishing, ransomware, and botnets before they reach subscriber devices. Three-layer protection: curated threat feeds, IP-level blocking, and AI-powered detection. No endpoint agents required.
Granular Content Policies
Enforce category-based and service-level filtering rules at the network or subscriber level. Choose from 20+ native filter categories and 1000+ individually controllable services.
Bandwidth Optimization
Block ads, trackers, crypto-mining scripts, and known bandwidth-abusing domains at the DNS layer. Reduce unwanted traffic before it consumes network resources.
Real-Time Analytics & Reporting
Full visibility into DNS query patterns, threat trends, and subscriber activity. One-month query log retention, CSV export, and SIEM streaming via Fluent Bit for compliance auditing.
Parental Controls as a Managed Service
Offer subscribers built-in parental controls with age-appropriate filtering, scheduling (block social media during school hours, open on weekends), and per-device profiles. A ready-made add-on product for families.
Carrier-Grade Reliability
A globally distributed Anycast network with automatic failover ensures high availability across regions. Configure fallback resolvers for additional redundancy.
With Control D, ISPs gain a managed DNS filtering layer that protects subscribers, satisfies regulatory requirements, and creates new revenue streams. Flat, transparent pricing. Full API access. No hardware to maintain.

How Control D Compares to Other DNS Filtering Providers

Traffic SteeringGo beyond blocking. Redirect specific services through proxy locations in 69+ countries at the DNS level. No VPN app needed on subscriber devices. Offer geo-shifting as a premium subscriber feature that no other DNS provider can match.
1000+ Service-Level ControlsDon't just block categories. Block, allow, or redirect individual services: specific streaming apps, social platforms, gaming networks, or productivity tools. Competitors work at the category level. Control D works at the app level.
Dual-Profile AssignmentAssign up to two profiles per subscriber endpoint: a network-wide ISP policy plus a subscriber-specific overlay. Enforce baseline protections globally while letting subscribers customize their own experience.
Time-Based RulesSet filtering policies that change by time of day. Block gaming during business hours, open social media on evenings and weekends. No other DNS filtering provider offers scheduling at this level.
Full Encrypted DNS SupportDNS-over-HTTPS, DNS-over-TLS, DNS-over-QUIC, and DNS-over-HTTP/3. The broadest encrypted DNS protocol support among DNS filtering providers. Protect subscriber privacy while maintaining policy enforcement.
Transparent PricingNo per-query charges or overage fees. Flat, predictable per-subscriber pricing that scales with your network.

Built for Every Type of ISP

Residential Broadband
Protect families with built-in parental controls and malware blocking. Offer tiered filtering plans as billable add-ons on home connections.
Business Internet
Provide SMB and enterprise clients with managed DNS security as part of their business internet package. Enforce web access policies without requiring endpoint software.
Rural & Fixed Wireless (WISPs)
Deliver safe internet to underserved communities with cloud-based DNS filtering that requires no CPE changes and minimal bandwidth overhead.
Hospitality & Public Venues
Ensure safe, filtered internet for guests at hotels, airports, and convention centers on your network. Block liability-creating content categories automatically.
Government & Municipal Networks
Meet government filtering mandates and protect public network infrastructure. Maintain audit-ready logs for compliance verification.
Mobile & MVNO
Apply DNS-level filtering to mobile subscriber traffic. Protect users on cellular connections without requiring app installation.
Deploy Across Your Network in MinutesPoint your resolvers to Control D and start protecting subscribers immediately. No hardware, no CPE changes, no firmware updates.
Already using another DNS filtering solution?Migrate to Control D with zero downtime. Run in parallel during transition.
01
Point DNS to Control DRedirect your network's DNS resolvers to Control D's Anycast addresses. Compatible with any router, DHCP server, or CGNAT setup. Supports legacy DNS, DoH, DoT, DoQ, and DoH3.
02
Create Subscriber ProfilesBuild filtering profiles per subscriber tier using the dashboard or API. Set baseline threat protection for all subscribers, add premium content filtering and parental controls for paid tiers.
03
Provision via APIIntegrate subscriber provisioning with your existing OSS/BSS stack through Control D's REST API. Automate profile assignment at signup, upgrade, or service change.
04
Monitor & ReportUse real-time analytics to track threat trends, query patterns, and subscriber activity. Export logs for compliance audits or stream to your SIEM.
05
Scale Without ReplanningAdd subscribers without provisioning new infrastructure. Control D's cloud-native architecture handles the growth.
Trusted by experts
"UI was straightforward, pricing made sense, and the interactions on initial calls were terrific""Control D is easy to deploy, and we've had to do very little to maintain it. And the response from the Control D team has been great."
Ian Winsemius
Staff Security Manager,
GitHub
"Great support and easy to setup on serverless environments""This is a great tool for serverless environments that need DNS filtering. The entire team that we have worked with is always very responsive and it's a pleasure getting to know their product better. Cost always comes into play but it is quite cheap per seat."
Thomas Farrell
Director of Operations,
Network Information Technologies, LLC
"Excellent DNS service""One of the best designed interfaces my team has ever interacted with. Not only is the product light years ahead of the competition, they are a fantastic partner to work with on a regular basis."
Rael Solin
Enterprise Lead Sales,
Pinnacle ICT

Frequently asked questions

Control D operates at the DNS layer. Point your DNS resolvers to Control D's Anycast addresses and filtering applies across your subscriber base immediately. No changes to routers, CPE, or core network infrastructure. We provide a full REST API for automated subscriber provisioning, making it easy to integrate with your OSS/BSS stack and manage profiles at scale. For ISPs that run on-prem resolvers, our open-source daemon (ctrld) can forward queries to Control D while preserving your existing DNS architecture.

Yes. Control D is built for this. Create tiered subscriber plans: basic threat protection, premium content filtering, parental controls, ad-free browsing, or any combination. Each tier maps to a Control D profile with its own filtering rules. Assign profiles through the dashboard or automate the entire flow via API. ISPs can configure which settings subscribers are able to adjust within their own profiles, while enforcing baseline protections at the network level.

Yes. Control D supports category-based and domain-level filtering that can be configured to meet local regulatory requirements, including mandatory parental controls (e.g., Italy's 2024 legislation), content blocking orders, and age verification mandates. Query logs are retained for one month and exportable as CSV for compliance audits. For real-time compliance monitoring, stream logs to your SIEM via our Fluent Bit integration.

No. Control D uses a globally distributed Anycast network. DNS queries route to the nearest healthy node, delivering low-latency resolution times. Independent testing shows single-digit millisecond response times, competitive with major public resolvers. Subscribers experience no perceptible slowdown.

Each subscriber (or household, or business account) gets their own filtering profile with custom rules. Profiles can include content filtering categories, service-level controls (block or allow specific apps), parental controls, and time-based scheduling rules. Control D also supports dual-profile assignment: enforce a network-wide ISP baseline plus a subscriber-specific overlay on the same endpoint. Manage everything through the dashboard or API.

Control D's Anycast network routes queries to the nearest healthy node automatically. If one node fails, traffic shifts to the next-closest node with no manual intervention and no subscriber impact. You can also configure fallback resolvers as an additional safety net.

Yes. Control D is cloud-native and designed for high-throughput DNS environments. The Anycast network handles millions of queries per second and scales automatically with subscriber growth. No capacity planning, no hardware upgrades, no infrastructure changes on your end.

Control D supports all four major encrypted DNS protocols: DNS-over-HTTPS (DoH), DNS-over-TLS (DoT), DNS-over-QUIC (DoQ), and DNS-over-HTTP/3 (DoH3). This is the broadest encrypted DNS support among DNS filtering providers. Subscribers get privacy from third-party snooping while your filtering policies remain fully enforced.

Running your own recursive resolver with filtering (e.g., RPZ-based blocking) requires hardware, threat intelligence feeds, ongoing blocklist maintenance, and engineering time to manage. Control D offloads all of that. Threat feeds update every 30 minutes. AI-powered detection catches domains that traditional feeds miss. You get a managed service with carrier-grade reliability, full analytics, and no infrastructure to maintain. Your team focuses on the network; we handle the filtering.

Predictable Pricing That Scales With Your Network

Per-subscriber pricingFlat rate per subscriber that decreases at volume. No per-query billing, no overage charges.
No hidden feesTransparent billing from day one. No setup costs, no minimum commitments for trials.
Tiered plan supportCreate differentiated subscriber offerings (basic protection, premium filtering, parental controls) on a single platform.
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