IPv6 Subnet Calculator - Vultr.com
www.vultr.com › resources › subnet-calculator-ipv6Both of these parts are calculated by the IP address and the number of mask bits. CIDR notation. CIDR notation is a standard syntax for writing IPv6 addresses with a routing prefix. It consists of an IPv6 address, a slash, then a number of bits to measure the routing prefix. 2002::1234:abcd:ffff:c0a8:101/64 is an example of IPv6 CIDR notation.