Energy Sector Web Filtering | NERC CIP Compliance & SCADA Protection

Why the Energy Sector Requires Specialized Web Filtering

Energy utilities and power generation companies operate the most critical infrastructure in any nation. A successful cyberattack on a utility can disrupt electrical service for millions of customers, compromise public safety, and cause cascading failures across interconnected systems. The convergence of operational technology (OT) and information technology (IT) has dramatically expanded the attack surface, making web filtering an essential layer in defense-in-depth strategies.

content risk actors ranging from nation-state APT groups to ransomware syndicates actively target energy companies. The 2021 Colonial Pipeline attack and ongoing campaigns against European energy providers demonstrate that these content risks are not theoretical. NERC CIP standards mandate multiple layers of electronic security perimeters, and web content filtering directly supports requirements in CIP-005, CIP-007, and CIP-010.

Our database of 100 million classified domains gives energy operators real-time visibility into every outbound connection attempt. By blocking known command-and-control infrastructure, restricted content domains, and unauthorized remote-access services at the DNS layer, you prevent content risks before they reach critical systems.

NERC CIP Compliance & Regulatory Alignment

Map web filtering controls directly to mandatory reliability standards for bulk electric systems

CIP-005: Electronic Security Perimeters

Web filtering enforces access control at the electronic security perimeter (ESP) by restricting outbound connectivity to only categorized, approved domains. Our API integrates with firewalls at ESP boundaries to block traffic to uncategorized or malicious destinations before it leaves the protected network.

CIP-007: System Security Management

CIP-007 requires security patches, malicious code prevention, and security event monitoring. Web filtering prevents endpoints from reaching unsafe content distribution domains, blocks access to exploit kits, and generates security event logs that feed into your SIEM for centralized monitoring and alerting.

CIP-010: Configuration Management

Documenting and controlling changes to the electronic security perimeter requires knowing which domains are accessible. Our classification database provides the reference taxonomy for allowlist/blocklist policies, and audit logs capture every policy change with timestamps and administrator attribution.

CIP-004: Personnel & Training

Insider content risk mitigation begins with controlling what users can access. Web filtering prevents both inadvertent and intentional access to data-exfiltration sites, unauthorized cloud storage, and anonymizing proxies. Usage reports support personnel risk assessments required under CIP-004 access management programs.

SCADA/ICS Network Segmentation Support

Operational technology networks controlling turbines, transformers, and distribution systems should never communicate with arbitrary internet destinations. Our API can be deployed at the IT/OT boundary to enforce strict domain allowlisting, ensuring that SCADA systems, RTUs, and PLCs can only reach authorized vendor update servers, NTP sources, and telemetry endpoints.

When an OT workstation attempts to resolve a domain outside the approved list, the request is blocked and a high-priority alert is generated. This "deny-by-default" posture aligns with IEC 62443 zone and conduit models, providing defense in depth at the DNS layer without impacting real-time control traffic.

Critical Infrastructure content risk Categories

Our classification engine identifies and blocks the content risk categories most relevant to energy operations

ICS-Targeted unsafe content

TRITON, Industroyer, Pipedream

C2 Infrastructure

APT staging servers

Spear restricted content Domains

Utility brand impersonation

Ransomware Delivery

Payload hosting, initial access

data leakage

Unauthorized file transfer

Anonymizing Proxies

Tor, VPN bypass services

Exploit Kit Hosting

Drive-by download sites

Nation-State Domains

Sanctioned country TLDs

Cryptomining

Resource hijacking scripts

Newly Registered Domains

Zero-day staging

Unauthorized Remote Access

Rogue RDP, TeamViewer

Shadow IT Services

Unapproved SaaS & cloud

Smart Grid Security

Advanced metering infrastructure (AMI), distributed energy resources (DERs), and grid-edge devices all communicate over IP networks. As the grid becomes smarter, the number of internet-connected endpoints in the energy ecosystem expands exponentially. Each endpoint represents a potential ingress point for attackers.

Our domain classification API can be embedded into smart grid head-end systems and gateway appliances to filter DNS traffic from millions of field devices. Compromised smart meters attempting to phone home to C2 infrastructure are blocked at the resolver level, preventing lateral movement into backend utility systems.

With sub-5ms lookup latency and 99.99% uptime SLA, our API is purpose-built for environments where downtime is not an option and microseconds matter.

Energy Sector Use Cases

How power companies, pipeline operators, and renewable energy firms deploy web filtering

Generation Facility OT Protection

Power plants running distributed control systems (DCS) and programmable logic controllers (PLCs) must restrict outbound internet access to vendor-approved destinations. Our API enables strict allowlisting at the IT/OT demarcation point, blocking all unclassified domains while permitting firmware update servers, SCADA cloud platforms, and authorized time sources.

Transmission & Distribution SOC

Security operations centers monitoring transmission networks need real-time domain intelligence. Integrate our classification API into SIEM platforms to enrich DNS logs with category labels, category scores, and content risk indicators. SOC analysts can instantly determine whether a flagged domain is a known C2 node, a restricted content site, or a benign vendor portal.

Renewable Energy Remote Sites

Wind farms and solar installations in remote locations rely on satellite or cellular connectivity with limited bandwidth. DNS-level filtering is the most bandwidth-efficient security control available, requiring no inline proxies or deep packet inspection appliances. Our API classifies domains with a single lightweight query per request.

Pipeline SCADA Networks

Oil and gas pipeline operators learned from Colonial Pipeline that IT/OT convergence creates existential risk. Web filtering at pipeline control centers prevents operators from browsing to compromised sites on shared workstations, blocking the initial access vectors that ransomware operators exploit to pivot from IT to OT environments.

100M

Domains Classified

Content Categories

<5ms

Lookup Latency

99.99%

API Uptime SLA

Deploying in Air-Gapped & Segmented Networks

Many energy OT environments are air-gapped or heavily segmented from the corporate IT network. We offer on-premise deployment options that replicate our full 90-million-domain database inside your security perimeter, synchronized via one-way data diodes or scheduled secure transfers.

For IT networks with standard internet connectivity, our cloud API delivers sub-5ms responses from globally distributed points of presence. Hybrid architectures are also supported: use the on-premise instance for OT zones and the cloud API for corporate IT, managed from a unified policy console.

Integration is straightforward regardless of deployment model. Our API speaks standard DNS over HTTPS (DoH), DNS over TLS (DoT), or REST endpoints compatible with any firewall, proxy, or DNS resolver in your environment.

On-premise appliance for air-gapped OT environments
Cloud API with globally distributed PoPs
Hybrid IT/OT deployment with unified policy management
SIEM integration via syslog, CEF, and REST

Case Study: Regional Electric Cooperative

A cooperative serving 350,000 meters across three states needed to achieve NERC CIP compliance for newly designated medium-impact BES Cyber Systems. Their existing firewall rules were based on IP addresses that changed frequently, creating compliance gaps flagged during a spot-check audit.

By deploying our domain classification API at the ESP boundary, the cooperative replaced fragile IP-based rules with category-based domain filtering. The API automatically classifies newly observed domains, eliminating the manual allowlist maintenance that consumed 20 hours per week of security analyst time. Their next NERC audit closed with zero findings.

"We went from chasing IP changes weekly to a set-and-forget domain policy. The API handles the classification, and we focus on actual security operations."
- CISO, Regional Electric Cooperative

Energy Web Filtering FAQ

Common questions about deploying web filtering in energy and utility environments

Does your solution meet NERC CIP requirements?

Yes. Our web filtering directly supports CIP-005 (Electronic Security Perimeters), CIP-007 (System Security Management), and CIP-010 (Configuration Management). We provide pre-mapped compliance reports that align blocked categories and audit logs to specific CIP requirement IDs, simplifying evidence collection during NERC audits.

Can this be deployed in air-gapped OT environments?

Yes. Our on-premise appliance contains the full classification database and operates without any internet connectivity. Database updates are delivered via encrypted files that can be transferred using data diodes, USB media in compliance with your media handling procedures, or scheduled secure file transfers across one-way network links.

What latency does your API introduce to DNS resolution?

Our cloud API averages under 5 milliseconds for classification lookups from North American points of presence. The on-premise appliance delivers sub-1ms responses since the entire database resides locally. Neither deployment model introduces perceptible latency to end-user browsing or machine-to-machine communications.

How does the API handle newly registered domains used in zero-day attacks?

Newly registered domains are flagged with a dedicated "Newly Observed" category. Energy customers can apply a policy that blocks or alerts on any domain less than 30 days old, which catches the vast majority of weaponized domains before they enter content classification feeds. Combined with our machine-learning classifier that evaluates domain characteristics in real time, coverage is near-immediate.

Do you support integration with our existing SIEM and SOAR platforms?

Absolutely. We export classification events via syslog (RFC 5424), CEF format for ArcSight, and REST webhooks for Splunk, Sentinel, and QRadar. Our API can also be called directly from SOAR playbooks to enrich indicators during incident response workflows.

Web Filtering for the Energy Sector