Caller ID Reputation® (CIDR) is the industry’s original and leading provider of phone number reputation management. Leveraging advanced technology and deep industry expertise, CIDR helps businesses optimize outbound calling performance and customer experience across the voice channel. CIDR enables organizations to achieve higher connection rates, improve ROI, support critical call delivery, and strengthen operational excellence. With over 50 million spam flags identified to date, CIDR offers the most complete and independent view of number health available—drawing from the broadest network of direct data integrations across major carriers, call analytics platforms, mobile apps, and both Android and iOS devices. Unlike competitors, all data is sourced through verified partnerships—not scraped—ensuring unmatched accuracy and speed. CIDR’s geographic, device-level, and carrier-specific scanning makes it the only truly comprehensive reputation monitoring solution in the U.S. The platform brings transparency, control, and performance optimization to every step of the call journey.