IPv6 subnet calculator

IPv6 CIDR range for 2600:3000::/25

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 2600:3000::/25

The prefix identifies a network with 103 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2600:3000::/25

Network mask

ffff:ff80::

Prefix length

/25

Host bits

103

First address

2600:3000::

Last address

2600:307f:ffff:ffff:ffff:ffff:ffff:ffff

Total addresses

10141204801825835211973625643008

Total addresses (human readable)

2^103 addresses (10,141,204,801,825,835,211,973,625,643,008; about 10.14 nonillion)

How this range is calculated

  1. 1The /25 prefix keeps the first 25 network bits fixed.
  2. 2Setting all 103 host bits to zero produces 2600:3000::.
  3. 3Setting those host bits to one produces 2600:307f: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

2600:3000:0000:0000:0000:0000:0000:0000

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