Simple definition
A notation such as /24 or /27 that indicates the size of an IP network.
Technical definition
Class60 Inter-Domain Routing represents an IP prefix by a significant number of bits. In IPv4, /24 corresponds for example to the 255255.255.0 mask.
What is it used for ?
Dimension sub-networks, summarize routes and organize a plan of address.
Practical example
The 192.168.10.0/24 network contains 256 addresses in total, of which 254 are generally available by hosts.
Common issues
- Prefix too small for the number of equipment
- Overlap between subnets
- Confusion between host and network address
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.