IPv6 subnet calculator

IPv6 CIDR range for 2605:b100:700::/41

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 2605:b100:700::/41

The prefix identifies a network with 87 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2605:b100:700::/41

Network mask

ffff:ffff:ff80::

Prefix length

/41

Host bits

87

First address

2605:b100:700::

Last address

2605:b100:77f:ffff:ffff:ffff:ffff:ffff

Total addresses

154742504910672534362390528

Total addresses (human readable)

2^87 addresses (154,742,504,910,672,534,362,390,528; about 154.74 septillion)

How this range is calculated

  1. 1The /41 prefix keeps the first 41 network bits fixed.
  2. 2Setting all 87 host bits to zero produces 2605:b100:700::.
  3. 3Setting those host bits to one produces 2605:b100:77f: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

2605:b100:0700:0000:0000:0000:0000:0000

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