To avoid confusion, we now use 'subnet' to talk about a subnet
represented with the CIDR notation, such as 10.0.0.0/8.
In in that case:
- 10.0.0.0/8 is a 'subnet'
- 10.0.0.0 is the 'prefix'
- 8 is the 'prefix length', or by extension the 'subnet length'
Use these words everywhere in the code and documentation for clarity.