IPv6 subnet calculator

IPv6 CIDR range for 2a01:111:2000::/36

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 2a01:111:2000::/36

The prefix identifies a network with 92 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2a01:111:2000::/36

Network mask

ffff:ffff:f000::

Prefix length

/36

Host bits

92

First address

2a01:111:2000::

Last address

2a01:111:2fff:ffff:ffff:ffff:ffff:ffff

Total addresses

4951760157141521099596496896

Total addresses (human readable)

2^92 addresses (4,951,760,157,141,521,099,596,496,896; about 4.95 octillion)

How this range is calculated

  1. 1The /36 prefix keeps the first 36 network bits fixed.
  2. 2Setting all 92 host bits to zero produces 2a01:111:2000::.
  3. 3Setting those host bits to one produces 2a01:111:2fff: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

2a01:0111:2000:0000:0000:0000:0000:0000

Recent network calculations

Recent IPv6 CIDR Ranges

Open recent IPv6 prefixes to inspect their normalized range, mask, and address capacity.

Learn how IPv6 CIDR notation and subnet ranges work