IPv6 subnet calculator

IPv6 CIDR range for 2002:a16:e1cd:7:cb21:bb::/111

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 2002:a16:e1cd:7:cb21:bb::/111

The prefix identifies a network with 17 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2002:a16:e1cd:7:cb21:bb::/111

Network mask

ffff:ffff:ffff:ffff:ffff:ffff:fffe:0

Prefix length

/111

Host bits

17

First address

2002:a16:e1cd:7:cb21:bb::

Last address

2002:a16:e1cd:7:cb21:bb:1:ffff

Total addresses

131072

Total addresses (human readable)

2^17 addresses (131,072; about 131.07 thousand)

How this range is calculated

  1. 1The /111 prefix keeps the first 111 network bits fixed.
  2. 2Setting all 17 host bits to zero produces 2002:a16:e1cd:7:cb21:bb::.
  3. 3Setting those host bits to one produces 2002:a16:e1cd:7:cb21:bb:1: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

2002:0a16:e1cd:0007:cb21:00bb:0000:0000

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