Xfinity

Largest U.S. cable broadband provider and a top-tier source of household-level first-party data for CTV and addressable TV advertising

Xfinity is the consumer brand of Comcast Cable Communications, one of the largest cable and broadband providers in the United States. Launched in 2010 as a rebranding of Comcast's residential services, Xfinity offers a broad portfolio including high-speed internet, cable television (Xfinity TV), mobile (Xfinity Mobile via MVNO on Verizon's network), home security and automation (Xfinity Home), and streaming services (Xfinity Stream). With over 32 million broadband subscribers and tens of millions of video subscribers, Xfinity represents one of the largest household-level data footprints in the country. In the AdTech ecosystem, Xfinity's significance extends well beyond its consumer services. The platform generates massive amounts of first-party, deterministic household data — including automatic content recognition (ACR) data from set-top boxes, broadband usage signals, and authenticated identity data — that feeds directly into Comcast's advertising division, Effectv (formerly Comcast Spotlight), and the Comcast Advertising platform. This data underpins audience targeting, cross-screen measurement, and attribution capabilities offered to advertisers and agencies through tools like the Comcast Audience Measurement System (CAMS). Xfinity's household data is particularly valuable in a post-cookie, privacy-first advertising landscape, as it provides authenticated, opt-in viewership intelligence at scale. Comcast has leveraged this asset through partnerships, data clean rooms, and integrations with DSPs and measurement vendors, positioning Xfinity's data infrastructure as a competitive moat in the converged TV and digital advertising market. The brand competes directly with Charter (Spectrum), AT&T/DirecTV, and streaming-native platforms for both subscribers and advertising dollars.