IPv6 subnet calculator

IPv6 CIDR range for fd99:6c43:d722:87e9:10:10:10:0/116

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 fd99:6c43:d722:87e9:10:10:10:0/116

The prefix identifies a network with 12 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fd99:6c43:d722:87e9:10:10:10:0/116

Network mask

ffff:ffff:ffff:ffff:ffff:ffff:ffff:f000

Prefix length

/116

Host bits

12

First address

fd99:6c43:d722:87e9:10:10:10:0

Last address

fd99:6c43:d722:87e9:10:10:10:fff

Total addresses

4096

Total addresses (human readable)

2^12 addresses (4,096; about 4.09 thousand)

How this range is calculated

  1. 1The /116 prefix keeps the first 116 network bits fixed.
  2. 2Setting all 12 host bits to zero produces fd99:6c43:d722:87e9:10:10:10:0.
  3. 3Setting those host bits to one produces fd99:6c43:d722:87e9:10:10:10:fff.

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

fd99:6c43:d722:87e9:0010:0010:0010:0000

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