Semcasting

Niche specialist in deterministic IP-based audience targeting and identity resolution, positioned as a privacy-safe alternative to cookie-based data providers

Semcasting is an audience intelligence and data technology company founded in 2010 and headquartered in North Andover, Massachusetts. The company is best known for its proprietary Smart Zones technology, which uses deterministic IP address-based targeting to build highly accurate audience segments without relying on cookies. By mapping IP addresses to physical locations and demographic attributes, Semcasting enables advertisers to reach precise audiences across digital channels with a high degree of accuracy and scale. The company's core offerings span audience segmentation, identity resolution, and data onboarding, serving agencies, brands, and media companies seeking privacy-compliant alternatives to cookie-based targeting. Semcasting's approach leverages a combination of public records, commercial data, and proprietary modeling to create deterministic audience profiles that can be activated across programmatic platforms, connected TV, and digital out-of-home channels. Semcasting occupies a niche but respected position in the AdTech ecosystem as a specialist in IP-based identity and audience data, particularly relevant in a post-cookie environment. The company competes with larger data providers and identity resolution platforms but differentiates itself through its deterministic methodology and focus on privacy-safe targeting. It has established partnerships with major DSPs and data marketplaces, making its audience segments accessible to a broad range of advertisers.