AWS Growth - Adding a Third Availability Zone in Tokyo

- Few now, but more soon as ISPs ramp up IPv6 deployment

- Almost none require v6

- It provides future compatibility as the v4 address space is (effectively) used up and can't cover new services joining the internet in the future. Full Internet conversion to v6 is critically needed and inevitable. Supporting it on a large service like AWS accelerates familiarity with the technology and enabled more people to silently begin making use of v6.

Outside the US there is a serious shortage of ipv4 addresses. But there are chicken egg problems using ipv6 so everyone needs to support it to help resolve these. Think of it as a helping hand for app developers in the developing world.

I use it as a filter too. The people who have implemented ipv6 are ahead of the curve so I look on them more favourably.