We’re Neon. We’re building Postgres that helps you confidently ship reliable and scalable apps. You can try Neon now for free. We recently added support for IPv6 addresses in the IP Allow feature. This post explains what IPv6 is and its benefits. IPv4 has been around for almost half a century, using 32-bit addresses which allowed for about 4.3 billion unique addresses, but this number is insufficient due to the explosive growth of the internet and smart devices. A solution was needed, and IPv6 was developed with 128-bit addresses that significantly expands the possible addresses to approximately 340 undecillion. This vast expansion solves the primary problem of IPv4 address exhaustion. Adding support for IPv6 addresses in IP Allow allows you to overcome IPv4 limitations, build highly scalable architectures while maintaining backward compatibility with existing IPv4 workloads. This is particularly useful for large-scale and containerized applications. Dual-stack devices will often attempt to connect using IPv6 first, but if the connection cannot be established over IPv6, it falls back to using IPv4.