IPv6 CIDR Calculator
Calculate IPv6 subnet information by entering an address with prefix length (e.g., 2001:db8::/32). Get detailed information about network range and address properties.
About IPv6 Addressing
IPv6 addresses are 128-bit addresses expressed in hexadecimal notation, divided into eight 16-bit blocks separated by colons. The prefix length specifies how many bits are used for the network portion of the address.
- A /128 represents a single IPv6 address
- A /64 is typically used for a single subnet (interface identifier bits)
- A /48 is commonly allocated to end sites
- A /32 is often allocated to ISPs
- Double colons (::) can be used once to compress multiple zero blocks
- Leading zeros in a block can be omitted