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acr. 1; normally an IP address notation such as 192.168.

  1. 0/24 indicating a block of addresses. The number after the slash indicates how many bits are in the mask; bits to the ''right'' are not masked. 2 Controlled Internal Drug Release; technology for the controlled release of a hormone or drug, for example as used to release progesterone in beef cattle.

CIDR (disambiguation)

CIDR is Classless Inter-Domain Routing, a method for allocating IP addresses and routing Internet Protocol packets.

CIDR may also refer to:

  • Controlled internal drug release, devices used in livestock for the synchronization of estrus
  • Conference on Innovative Data Systems Research
  • CIDR-FM, an FM radio station in Windsor, Ontario, Canada