$ipv6-calc 2001:db8::/64

IPv6 Subnet Calculator

Enter an IPv6 address with a prefix length to calculate the network address, address range, and subnet size for any IPv6 block. Get expanded and compressed forms, total address count, and prefix boundaries — everything you need for IPv6 network planning and address allocation. Run the subnet calculator to find every parameter of your subnet: mask, network address, broadcast, host count, and CIDR prefix.

Input

IPv6 Address

Prefix Length

Common prefixes:

IPv6 Subnet Details

Network Address
-

Full IPv6 Address

Prefix Length

Network Bits

Host Bits

Address Type

Address Scope

Address Range

First Address

Last Address

Total Addresses

Related Network Tools

Explore these related tools for subnet calculation and IP address management. Use the subnet mask calculator to convert between CIDR notation and dotted-decimal mask format for firewall and ACL configuration.

Additional networking calculators for IP address planning and network analysis. Run the cidr calculator to convert a CIDR prefix into its full set of subnet parameters for firewall rule planning.

More tools to support network design, addressing, and subnet troubleshooting. Use the ipv6 address expander to expand compressed IPv6 notation for use in systems that require the full address representation.

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