CIDR

Definitions

Computing

  • noun a system of organising IP addresses that is more compact and efficient than the older system, adding a slash and a new IP prefix number that represents a number of individual addresses. For example the old system used an IP address such as ‘194.124.0.0’ whereas CIDR would replace this with ‘194.124.0.0/12’. The IP Prefix number 12 represents 4,096 unique addresses, and the lower the number the more addresses are represented.

Electronics

  • acronym forclassless inter-domain routing
  • A technique in which routers group routes together so as to reduce the information carried by the core routers. Also spelled classless interdomain routing. Its abbreviation is CIDR.
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