IPv6 subnet calculator

IPv6 CIDR range for 240e::/17

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 240e::/17

The prefix identifies a network with 111 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

240e::/17

Network mask

ffff:8000::

Prefix length

/17

Host bits

111

First address

240e::

Last address

240e:7fff:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

2596148429267413814265248164610048

Total addresses (human readable)

2^111 addresses (2,596,148,429,267,413,814,265,248,164,610,048; about 2.59 decillion)

How this range is calculated

  1. 1The /17 prefix keeps the first 17 network bits fixed.
  2. 2Setting all 111 host bits to zero produces 240e::.
  3. 3Setting those host bits to one produces 240e:7fff: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

240e:0000:0000:0000:0000:0000:0000:0000

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