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 29 host bits. Every address from the first address through the last address belongs to this range.
CIDR prefix
fd00:dead:beef::/99
Network mask
ffff:ffff:ffff:ffff:ffff:ffff:e000:0
Prefix length
/99
Host bits
29
First address
fd00:dead:beef::
Last address
fd00:dead:beef::1fff:ffff
Total addresses
536870912
Total addresses (human readable)
2^29 addresses (536,870,912; about 536.87 million)
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
fd00:dead:beef:0000:0000:0000:0000:0000
Recent network calculations
Open recent IPv6 prefixes to inspect their normalized range, mask, and address capacity.