Hey guys, Facebook reports that they are in the process of turning IPv4 off within their data centers. Can anyone explain me the possible reasons behind this decision?

Other companies also like this idea and are probably going to do this soon as well.

The source of information: https://nfware.com/blog-migration-to-ipv6

For example, Comcast IPv6 deployment is at approximately 66%. British Sky Broadcasting IPv6 deployment is above 86%, Deutsche Telekom has 56%, XS4ALL has 71%, VOO has 73% and Telenet has 63%.

In terms of mobile wireless, Reliance Jio and Verizon Wireless report that about 90% of its traffic uses IPv6. The percent of smartphones in the US on the major cellular network operators (AT&T, Sprint, T-Mobile and Verizon) that use IPv6 has increased from 40% to 80% within the past three years. Furthermore, T-Mobile is going to turn IPv4 off and use only IPv6 within their mobile network. Other major wireless providers are intending to do the same thing as T-Mobile.