Cox and Xfinity are two different companies. Cox is a privately-owned subsidiary of Cox Enterprises headquartered in Sandy Springs, GA. Xfinity is owned by parent company Comcast Corp. headquartered in Philadelphia, PA.

Xfinity is the brand name that Comcast uses for internet service. It’s called the Xfinity 10G Network. The 10G speeds are along fiber optic cable but Xfinity also uses coaxial cables in its network. The 10G service is available in about 40 markets nationwide. These include Atlanta, Boston, Chicago, Denver, Houston, Miami, Philadelphia, Salt Lake City, Seattle, San Francisco, Washington D.C. and parts of New Mexico. Xfinity also bundles cable TV, phone, and wired and wireless internet in packages.

Cox offers residential internet using two different cable types: coaxial and fiber optic. The majority of the network runs along fiber optic cable with the last mile of signal to your home carried along coaxial cable. Cox offers internet plans ranging from 100 Mbps of download speed all the way to 2 Gig. Cox internet is available in parts of Arkansas, Arizona, California, Connecticut, Florida, Georgia, Iowa, Idaho, Kansas, Louisiana, Massachusetts, Missouri, North Carolina, Nebraska, Nevada, Ohio, Oklahoma, Rhode Island, Virginia, and Washington D.C. Cos offers bundles for TV, internet and home phone.