IPv6 subnet calculator

IPv6 CIDR range for 1111:2222:aaaa:bbbb:ffff:ffff:ffff:0/124

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 1111:2222:aaaa:bbbb:ffff:ffff:ffff:0/124

The prefix identifies a network with 4 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

1111:2222:aaaa:bbbb:ffff:ffff:ffff:0/124

Network mask

ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff0

Prefix length

/124

Host bits

4

First address

1111:2222:aaaa:bbbb:ffff:ffff:ffff:0

Last address

1111:2222:aaaa:bbbb:ffff:ffff:ffff:f

Total addresses

16

Total addresses (human readable)

2^4 addresses (16)

How this range is calculated

  1. 1The /124 prefix keeps the first 124 network bits fixed.
  2. 2Setting all 4 host bits to zero produces 1111:2222:aaaa:bbbb:ffff:ffff:ffff:0.
  3. 3Setting those host bits to one produces 1111:2222:aaaa:bbbb:ffff:ffff:ffff:f.

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

1111:2222:aaaa:bbbb:ffff:ffff:ffff: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