ContributionsMost RecentMost LikesSolutionsRe: Static IP Addresses... You can alsohave a business account at a residential location with a static IP. Cox does charge $5 a month for each additional static IP number that youlease from Cox. If you have a business account your email address will behrcoxmail.com instead of cox.net. There is no reason for a Cox assigned static IP to change unless it is not set up as static in the router.