CIDR Aggregation Example
Exodus (an ISP) owns:
- 209.185.0.0 - 209.185.255.255, (class Cs)
- 256 Class Cs represented as 209.185/16
Customers get some chunk, say 8:
- example: 209.185.8.0 - 209.185.15.0, represented as 209.185.8/21
- impact: changing ISP or connectivity usually requires renumbering!