IPv6 subnet calculator

IPv6 CIDR range for 2001:db8::/32

Calculate the network address, final address, mask, and exact address capacity of any IPv6 CIDR prefix.

Example: 2606:4700::/32

Host bits are normalized to the network address before the range is calculated.

CIDR calculation

Network details for 2001:db8::/32

The prefix identifies a network with 96 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2001:db8::/32

Network mask

ffff:ffff::

Prefix length

/32

Host bits

96

First address

2001:db8::

Last address

2001:db8:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

79228162514264337593543950336

Total addresses (human readable)

2^96 addresses (79,228,162,514,264,337,593,543,950,336; about 79.22 octillion)

How this range is calculated

  1. 1The /32 prefix keeps the first 32 network bits fixed.
  2. 2Setting all 96 host bits to zero produces 2001:db8::.
  3. 3Setting those host bits to one produces 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff.

Network address

The normalized prefix base

CIDR notation describes a network, not a single host. If an address with host bits set is entered, this calculator normalizes it to the network base before calculating the range.

Expanded network address

2001:0db8:0000:0000:0000:0000:0000:0000

About this IPv6 prefix

IPv6 documentation prefix: 2001:db8::/32

This prefix is reserved for documentation and examples. Use it in guides, diagrams, and configuration samples instead of a real routed network.

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