IPv6 subnet calculator.

Subnetting in IPv4 and IPv6 serves a similar purpose—breaking up large networks into smaller parts—but it works differently because of how each version handles addresses.

**IPv4** addresses are limited, so subnetting is all about making the most of what you have. You take a 32-bit address and divide it into network and host portions using subnet masks (like /24 or /28). It's about squeezing the right number of addresses into the right size for each network.

With **IPv6**, there's no need to worry about running out of addresses. You're working with 128-bit addresses, so the standard practice is to use /64 subnets, which provide an enormous number of IPs per subnet. Instead of worrying about conserving addresses, IPv6 subnetting is about logically organizing and dividing networks in a way that makes sense for growth and segmentation. This means it's usually simpler and more focused on flexibility while still providing enough space for anything you might need.

IPv4 subnetting is about using a limited resource efficiently, while IPv6 subnetting is about creating a logical structure with plenty of room to grow.