The number preceded by a $"/"$ next to an IP address and$$expressed in CIDR notation $($e$.$g$.,192\mathrm{.}168\mathrm{.}56\mathrm{.}100/16)$ specifies the network mask which helps us identify the "Network Prefix or Network part" of an IP address. In other words, the number tells us how many left most bits denote the "network part" in an IP address.

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