IPv6 subnet calculator

IPv6 CIDR range for fd12:3456:789a:500:192:168:200:0/112

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 fd12:3456:789a:500:192:168:200:0/112

The prefix identifies a network with 16 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fd12:3456:789a:500:192:168:200:0/112

Network mask

ffff:ffff:ffff:ffff:ffff:ffff:ffff:0

Prefix length

/112

Host bits

16

First address

fd12:3456:789a:500:192:168:200:0

Last address

fd12:3456:789a:500:192:168:200:ffff

Total addresses

65536

Total addresses (human readable)

2^16 addresses (65,536; about 65.53 thousand)

How this range is calculated

  1. 1The /112 prefix keeps the first 112 network bits fixed.
  2. 2Setting all 16 host bits to zero produces fd12:3456:789a:500:192:168:200:0.
  3. 3Setting those host bits to one produces fd12:3456:789a:500:192:168:200: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

fd12:3456:789a:0500:0192:0168:0200:0000

Recent network calculations

Recent IPv6 CIDR Ranges

Open recent IPv6 prefixes to inspect their normalized range, mask, and address capacity.

Learn how IPv6 CIDR notation and subnet ranges work