IP & Subnet Tools
IPv6 Subnet Calculator
Enter an IPv6 address with a prefix to get the network range and /64 counts.
📖 New to this? Read What Is IPv6 and Why Do We Need It?.
❓ Frequently Asked Questions
What is the IPv6 Subnet Calculator used for?
Calculate the network, first/last address, and subnet counts for an IPv6 prefix.
Is the IPv6 Subnet Calculator free and private?
Yes — it's completely free and runs entirely in your browser. Whatever you enter stays on your device and is never uploaded to any server.
Do I need to install anything to use the IPv6 Subnet Calculator?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.