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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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When writing blacklist automation for my network, is there a way to automatically determine the prefix size of the other party? …
asked Sep 24 '17 by user40176