Making the Address Efficient
All methods provide for extending the life of IPv4.
CIDR is very similar to VLSM.
Address allocated in blocks.
- Example: 205.24.0.0/16 means that the address range of 205.24.0.0 through 205.24.255.0 (256 Class Cs) is assigned to one ISP or consumer, etc.
Block assignment allows for one route to be placed in the Internet routing tables.
It allows the ISP to break up the addresses and efficiently hand them out to its customers.
Consumers must detail their addressing requirements to the ISP.
Address assignments are still conservative.