IPv6 subnet calculator

IPv6 CIDR range for ff00::/13

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 ff00::/13

The prefix identifies a network with 115 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

ff00::/13

Network mask

fff8::

Prefix length

/13

Host bits

115

First address

ff00::

Last address

ff07:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

41538374868278621028243970633760768

Total addresses (human readable)

2^115 addresses (41,538,374,868,278,621,028,243,970,633,760,768; about 41.53 decillion)

How this range is calculated

  1. 1The /13 prefix keeps the first 13 network bits fixed.
  2. 2Setting all 115 host bits to zero produces ff00::.
  3. 3Setting those host bits to one produces ff07:ffff: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

ff00:0000:0000:0000:0000:0000:0000:0000

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