IPv6 subnet calculator

IPv6 CIDR range for 2002:a17::/57

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 2002:a17::/57

The prefix identifies a network with 71 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2002:a17::/57

Network mask

ffff:ffff:ffff:ff80::

Prefix length

/57

Host bits

71

First address

2002:a17::

Last address

2002:a17:0:7f:ffff:ffff:ffff:ffff

Total addresses

2361183241434822606848

Total addresses (human readable)

2^71 addresses (2,361,183,241,434,822,606,848; about 2.36 sextillion)

How this range is calculated

  1. 1The /57 prefix keeps the first 57 network bits fixed.
  2. 2Setting all 71 host bits to zero produces 2002:a17::.
  3. 3Setting those host bits to one produces 2002:a17:0:7f: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

2002:0a17:0000:0000:0000:0000:0000:0000

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