IPv6 CIDR Blocks
The large address size used in IPv6 permitted implementation of world-wide route summarization and guaranteed sufficient address pools at each site. The standard subnet size for IPv6 networks is a /64 block, which is required for the operation of stateless address autoconfiguration. At first, the IETF recommended in RFC 3177 as a best practice that all end sites receive a /48 address allocation, however, criticism and reevaluation of actual needs and practices has led to more flexible allocation recommendations in RFC 6177 suggesting allocating significantly more than one standard subnet, such as a /56 block.
Read more about this topic: Classless Inter-Domain Routing
Famous quotes containing the word blocks:
“Good blocks of oak it was I split,
As large around as the chopping block;
And every piece I squarely hit
Fell splinterless as a cloven rock.”
—Robert Frost (1874–1963)