IPv6 subnet calculator

IPv6 CIDR range for 2a01:111:f403::/50

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 2a01:111:f403::/50

The prefix identifies a network with 78 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

2a01:111:f403::/50

Network mask

ffff:ffff:ffff:c000::

Prefix length

/50

Host bits

78

First address

2a01:111:f403::

Last address

2a01:111:f403:3fff:ffff:ffff:ffff:ffff

Total addresses

302231454903657293676544

Total addresses (human readable)

2^78 addresses (302,231,454,903,657,293,676,544; about 302.23 sextillion)

How this range is calculated

  1. 1The /50 prefix keeps the first 50 network bits fixed.
  2. 2Setting all 78 host bits to zero produces 2a01:111:f403::.
  3. 3Setting those host bits to one produces 2a01:111:f403:3fff: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

2a01:0111:f403:0000:0000:0000:0000:0000

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