IPv6 subnet calculator

IPv6 CIDR range for fd00:dead:beef::/69

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:dead:beef::/69

The prefix identifies a network with 59 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fd00:dead:beef::/69

Network mask

ffff:ffff:ffff:ffff:f800::

Prefix length

/69

Host bits

59

First address

fd00:dead:beef::

Last address

fd00:dead:beef:0:7ff:ffff:ffff:ffff

Total addresses

576460752303423488

Total addresses (human readable)

2^59 addresses (576,460,752,303,423,488; about 576.46 quadrillion)

How this range is calculated

  1. 1The /69 prefix keeps the first 69 network bits fixed.
  2. 2Setting all 59 host bits to zero produces fd00:dead:beef::.
  3. 3Setting those host bits to one produces fd00:dead:beef:0:7ff: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

fd00:dead:beef:0000:0000:0000:0000:0000

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