IPv6 subnet calculator
Calculate the network address, final address, mask, and exact address capacity of any IPv6 CIDR prefix.
CIDR calculation
The prefix identifies a network with 0 host bits. Every address from the first address through the last address belongs to this range.
CIDR prefix
fd11:5ee:bad:c0de::2/128
Network mask
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Prefix length
/128
Host bits
0
First address
fd11:5ee:bad:c0de::2
Last address
fd11:5ee:bad:c0de::2
Total addresses
1
Total addresses (human readable)
2^0 addresses (1)
How this range is calculated
Network address
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
fd11:05ee:0bad:c0de:0000:0000:0000:0002
Recent network calculations
Open recent IPv6 prefixes to inspect their normalized range, mask, and address capacity.