Look up CIDR in Wiktionary, the free dictionary.

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

CIDR may also refer to:

Biology and medicine

• Controlled internal drug release, devices used in livestock for the synchronization of estrus
• Center for Infectious Disease Research at the University of Wisconsin
• Center for Global Infectious Disease Research, now a part of the Seattle Children's Research Institute
• Not to be confused with the Center for Infectious Disease Research and Policy at UMinn

Miscellaneous other uses

• Conference on Innovative Data Systems Research
• CIDR-FM, an FM radio station in Windsor, Ontario, Canada

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