IPv6 subnet calculator

IPv6 CIDR range for fd00::/83

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 fd00::/83

The prefix identifies a network with 45 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fd00::/83

Network mask

ffff:ffff:ffff:ffff:ffff:e000::

Prefix length

/83

Host bits

45

First address

fd00::

Last address

fd00::1fff:ffff:ffff

Total addresses

35184372088832

Total addresses (human readable)

2^45 addresses (35,184,372,088,832; about 35.18 trillion)

How this range is calculated

  1. 1The /83 prefix keeps the first 83 network bits fixed.
  2. 2Setting all 45 host bits to zero produces fd00::.
  3. 3Setting those host bits to one produces fd00::1fff: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

fd00:0000:0000:0000:0000:0000:0000:0000

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