IPv6 subnet calculator

IPv6 CIDR range for 2a00:23c0::/29

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 2a00:23c0::/29

The prefix identifies a network with 99 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2a00:23c0::/29

Network mask

ffff:fff8::

Prefix length

/29

Host bits

99

First address

2a00:23c0::

Last address

2a00:23c7:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

633825300114114700748351602688

Total addresses (human readable)

2^99 addresses (633,825,300,114,114,700,748,351,602,688; about 633.82 octillion)

How this range is calculated

  1. 1The /29 prefix keeps the first 29 network bits fixed.
  2. 2Setting all 99 host bits to zero produces 2a00:23c0::.
  3. 3Setting those host bits to one produces 2a00:23c7: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

2a00:23c0:0000:0000:0000:0000:0000:0000

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