Deployment of Internet Protocol Version 6 (IPv6), the next generation of the Internet Protocol, has been in progress since the mid-2000s. IPv6 was designed as a replacement for IPv4. IPv4 has been in use since 1982, and is in the final stages of exhausting its unallocated address space, but still carries most Internet traffic. Google's statistics show IPv6 availability of its users at around 30.30–35.10% depending on the day of the week (greater on weekends), as of April 2021. Adoption is uneven across countries and Internet service providers. Many countries have 0% use while a few have over 50% use, such as India and Germany.In November 2016, 1,491 (98.2%) of the 1,519 top-level domains (TLDs) in the Internet supported IPv6 to access their domain name servers, and 1,485 (97.8%) zones cont