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For questions about network prefixes, where the routing prefix may be expressed in Classless Inter-Domain Routing (CIDR) notation written as the first address of a network, followed by a slash character (/), and ending with the bit-length of the prefix. For instance, you are trying to find the prefix you want to announce on your router.
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How is the IP prefix passed to the router?
An IP address will have an IP prefix which determines the "Network" part of the IP address and the rest will determine the "Host". … The length of the prefix corresponds to a
binary mask of 1s in the network portion. When written out this way,
it is called a subnet mask. …