Overview

DNS filtering protects public libraries by blocking harmful content, ensuring regulatory compliance, and enhancing privacy. This guide covers implementation strategies and best practices for library environments.

Key Benefits of DNS Filtering for Libraries

• CIPA Compliance: Automatically blocks inappropriate content to meet federal funding requirements.
• Customizable Filters: Libraries can tailor access across over 35 content categories for different user groups.
• Network Security: Stops malware, phishing, and other threats before they reach users.
• Privacy Protection: Encrypted DNS protocols like DoH and DoT secure patron activity.

How DNS Filtering Works

The filtering mechanism checks website requests against a database. Safe sites receive access while harmful ones display warning pages instead. This prevents connections to dangerous domains before they are established, providing a transparent layer of protection for all library patrons.

Essential Features

Content Filtering: Category-based blocking, custom block lists, and age-appropriate settings allow libraries to balance accessibility with safety.

Encrypted Protocols: DNS-over-HTTPS and DNS-over-TLS protect sensitive library data and patron records from interception.

Monitoring Tools: Real-time threat detection, bandwidth management, compliance reporting, and role-based dashboards support operational needs.

Implementation Best Practices

• Conduct quarterly staff training and monthly patron education
• Perform regular technical audits
• Gather feedback through surveys
• Review and update policies regularly
• Test configurations for SSL certificates and static IP addresses

Real-World Example

The Nebraska Library Commission provides DNS filtering services to public libraries at no cost, supporting security, regulatory compliance, and cost management across the state. This demonstrates how centralized DNS filtering can be deployed at scale to protect library networks efficiently.