IPv6 subnet calculator

IPv6 CIDR range for fec0::/60

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 fec0::/60

The prefix identifies a network with 68 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fec0::/60

Network mask

ffff:ffff:ffff:fff0::

Prefix length

/60

Host bits

68

First address

fec0::

Last address

fec0::f:ffff:ffff:ffff:ffff

Total addresses

295147905179352825856

Total addresses (human readable)

2^68 addresses (295,147,905,179,352,825,856; about 295.14 quintillion)

How this range is calculated

  1. 1The /60 prefix keeps the first 60 network bits fixed.
  2. 2Setting all 68 host bits to zero produces fec0::.
  3. 3Setting those host bits to one produces fec0::f: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

fec0:0000:0000:0000:0000:0000:0000:0000

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