Classless addressing example
A large ISP gets a large block of addresses
- e.g., a /16 prefix, or 65536 separate addresses
Allocate smaller blocks to customers
- e.g., a /22 prefix (1024 addresses) to one customer, and a /28 prefix (16 addresses) to another customer
An organisation that gets a /22 prefix from their ISP divides it into smaller blocks
- e.g. a /26 prefix (64 addresses) for one department, and a /27 prefix (32 addresses) for another department