We make updates to our outbound IP list relatively infrequently, however we recommend you update your own whitelists or any partner's whitelists on a monthly or quarterly basis to make sure you are not missing any outbound data connections to partners that leverage a whitelist. You will want to make sure that if you use whitelists for receiving data from CAKE, please update your own systems as well as your partners (Buyers) with the all of the IPs listed in this file.  

http://cakecdn.com/ip_whitelist.txt