IPv6 subnet calculator

IPv6 CIDR range for 240b::/26

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 240b::/26

The prefix identifies a network with 102 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

240b::/26

Network mask

ffff:ffc0::

Prefix length

/26

Host bits

102

First address

240b::

Last address

240b:3f:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

5070602400912917605986812821504

Total addresses (human readable)

2^102 addresses (5,070,602,400,912,917,605,986,812,821,504; about 5.07 nonillion)

How this range is calculated

  1. 1The /26 prefix keeps the first 26 network bits fixed.
  2. 2Setting all 102 host bits to zero produces 240b::.
  3. 3Setting those host bits to one produces 240b:3f: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

240b:0000:0000:0000:0000:0000:0000:0000

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