IPv6 subnet calculator

IPv6 CIDR range for 2409:896a:4000::/38

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 2409:896a:4000::/38

The prefix identifies a network with 90 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2409:896a:4000::/38

Network mask

ffff:ffff:fc00::

Prefix length

/38

Host bits

90

First address

2409:896a:4000::

Last address

2409:896a:43ff:ffff:ffff:ffff:ffff:ffff

Total addresses

1237940039285380274899124224

Total addresses (human readable)

2^90 addresses (1,237,940,039,285,380,274,899,124,224; about 1.23 octillion)

How this range is calculated

  1. 1The /38 prefix keeps the first 38 network bits fixed.
  2. 2Setting all 90 host bits to zero produces 2409:896a:4000::.
  3. 3Setting those host bits to one produces 2409:896a:43ff: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

2409:896a:4000:0000:0000:0000:0000:0000

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