IPv6 subnet calculator

IPv6 CIDR range for fc00:6:76:6c6:a:b:c:0/111

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 fc00:6:76:6c6:a:b:c:0/111

The prefix identifies a network with 17 host bits. Every address from the first address through the last address belongs to this range.

CIDR prefix

fc00:6:76:6c6:a:b:c:0/111

Network mask

ffff:ffff:ffff:ffff:ffff:ffff:fffe:0

Prefix length

/111

Host bits

17

First address

fc00:6:76:6c6:a:b:c:0

Last address

fc00:6:76:6c6:a:b:d:ffff

Total addresses

131072

Total addresses (human readable)

2^17 addresses (131,072; about 131.07 thousand)

How this range is calculated

  1. 1The /111 prefix keeps the first 111 network bits fixed.
  2. 2Setting all 17 host bits to zero produces fc00:6:76:6c6:a:b:c:0.
  3. 3Setting those host bits to one produces fc00:6:76:6c6:a:b:d: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

fc00:0006:0076:06c6:000a:000b:000c:0000

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