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4.1.1 IP address ranges

In the access control lists below, host ranges can be specified in a number of ways i) as substrings, ii) as address ranges denoted by the "-" hyphen, or iii) as CIDR (Classless Inter Domain Routing) notation. For example
In the CIDR notation, the slash followed by a number indicates the netmask, or the number of bits which are common to a group of hosts. Normally, this is connected to a specific subnet, but here it simply represents the number of bits from the left which are fixed for matching; all remaining bits are wildcards. The following forms are equivalent:

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