The function getaddrinfo() has long been the recommended cross-platform way to look up IP addresses for a given host. Version 24 of the Dropbox client, released April 17, 2017, supports IPv6-only and dual-stack networks. Given these trends, we recently took the initiative to add IPv6 support for the Dropbox desktop application. Cellular carriers are switching to IPv6-only networks, meaning devices have no IPv4 connectivity, but rely on a NAT64/DNS64 gateway to connect to legacy IPv4 internet networks. ISPs and private networks within enterprises are moving to IPv6-only or dual-stack networks (those that support both IPv6 and IPv4 connections). This is finally changing.Īs of April 10, 2017, Google reported IPv6 adoption at 14%, with the United States at just over 30%. Unfortunately, IPv6 has suffered from lack of adoption. The current protocol-Internet Protocol version 6 (IPv6)-fixes various problems with IPv4 it has a significantly expanded address space that allows for the creation of many more unique IP addresses. Layers and layers of workarounds have been built to mitigate the problem. As more of the world has come online, and we carry internet-capable devices in our pockets, we have run out of IPv4 addresses. For decades the world has used Internet Protocol version 4 (IPv4), which allows for about 4 billion unique addresses. Computers on the internet are uniquely identified by an IP address.
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