4SD, commonly referred to as Channel 4 San Diego (and also known as Channel 4 Padres or COX 4, and originally known as KCOX) is an American cable television channel serving San Diego, California that is owned by Cox Communications.More or less, it originally operated as a regional sports network for San Diego County, with a mixed format resembling that of Denver-based regional sports network Altitude Sports and Entertainment; but with the loss of the network's television rights to many professional and collegiate sports teams in recent years, its programming has shifted more towards public interest programs as well as local programming, informercials and older television series that the channel had been carrying before losing the majority of its sports programming.