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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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Possible (bit) patterns of a netmask

RFC950 states that Since the bits that identify the subnet are specified by a bitmask, they need not be adjacent in the address. However, we recommend that the subnet bits be contiguous and located a …
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