IPv6 network addresses can have a prefix length between 1 and 128. IPv4 network addressesĬan have a prefix length between 1 and 32. With variable-length subnetting, the prefix length does not have to be a multiple of 8. Table 7-2 Wildcard Address, Netmask, and Prefix Length The prefix length determines the size of the subnetĪnd is the number of 1 bits in the netmask. A optional Prefix Length can be specified in the form of an integer. The netmask determines the prefix that has to be common to all the addresses belonging to a subnetwork.įor example, the IP address 192.168.123.0 is a wildcard with a netmask = 255.255.255.0. A subnetwork is defined by its IP address and its netmask. A wildcard IP address is the IP address of a subnetwork.
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