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Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet .
Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.
The subnet mask or CIDR notation determines how the IP address is divided into network and host parts. The term subnet mask is only used within IPv4. Both IP versions however use the CIDR concept and notation. In this, the IP address is followed by a slash and the number (in decimal) of bits used for the network part, also called the routing ...
It was initially released on May 29, 2003 by the German company Paessler GmbH which was founded by Dirk Paessler in 2001. [ 2 ] The software is available in three versions: a classic standalone solution ( PRTG Network Monitor) , one for large and distributed networks ( PRTG Enterprise Monitor) and a SaaS -version ( PRTG Hosted Monitor) .
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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
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