Piwik PRO Cloud is working for the Internet Protocol version 6 (also called IPv6). Piwik PRO Private cloud and On-premises is working for IPv6 on demand.
Currently, IPv4 is the most popular version of the protocol in the web world. It uses a 32-bit addressing scheme and looks, for example, like this: 196.222.0.255. The IPv6 uses 128-bit addressing and looks, for example, like this: 2001:cdba:0000:0000:0000:0000:3257:9652.