IPv6 subnet calculator

IPv6 CIDR range for 2003:cb:bbc4:df00:194b:25e::/96

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 2003:cb:bbc4:df00:194b:25e::/96

The prefix identifies a network with 32 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2003:cb:bbc4:df00:194b:25e::/96

Network mask

ffff:ffff:ffff:ffff:ffff:ffff::

Prefix length

/96

Host bits

32

First address

2003:cb:bbc4:df00:194b:25e::

Last address

2003:cb:bbc4:df00:194b:25e:ffff:ffff

Total addresses

4294967296

Total addresses (human readable)

2^32 addresses (4,294,967,296; about 4.29 billion)

How this range is calculated

  1. 1The /96 prefix keeps the first 96 network bits fixed.
  2. 2Setting all 32 host bits to zero produces 2003:cb:bbc4:df00:194b:25e::.
  3. 3Setting those host bits to one produces 2003:cb:bbc4:df00:194b:25e: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

2003:00cb:bbc4:df00:194b:025e:0000:0000

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