The Canadian Internet Registration Authority (CIRA) is a not-for-profit Canadian corporation that is responsible for operating the .ca country code Top-Level Domain (TLD). As the number of .ca domains continues to grow, international DNS network expansion is critical in providing a reliable, high-performance TLD. Rather than expanding its existing DNS network, CIRA is utilizing the UltraDNS platform to increase on-demand capacity to handle large volumes of traffic and also to gain software code diversity within its network environment. Achieving code diversity provides enhanced security, and is becoming standard operating procedure for the TLD community. With the UltraDNS Managed DNS Service, CIRA also will benefit from the DNS Shield, a revolutionary extension of the UltraDNS infrastructure.