additional cost of a static ip address
8 May 2012 12:12 AM. You can also have a business account at a residential location with a static IP. Cox does charge $5 a month for each additional static IP number that you lease from Cox. If you have a business account your email address will be hrcoxmail.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.