IPv6 subnet calculator

IPv6 CIDR range for ::/19

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 ::/19

The prefix identifies a network with 109 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

::/19

Network mask

ffff:e000::

Prefix length

/19

Host bits

109

First address

::

Last address

0:1fff:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

649037107316853453566312041152512

Total addresses (human readable)

2^109 addresses (649,037,107,316,853,453,566,312,041,152,512; about 649.03 nonillion)

How this range is calculated

  1. 1The /19 prefix keeps the first 19 network bits fixed.
  2. 2Setting all 109 host bits to zero produces ::.
  3. 3Setting those host bits to one produces 0:1fff: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

0000:0000:0000:0000:0000:0000:0000:0000

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