IPv4 addresses

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IPv4
IPv4 address
How many IPv4 addresses are possible?

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  • TomLiotta
    There is a theoretical design limit of 4294967296 (i.e., 4 billion+) unique addresses, but there are various considerations that bring the number of usable addresses down from that. Knowing the number is not very useful; knowing how the number is derived is what's important. And network and broadcast addresses are reserved in each subnetwork, so it's necessary to know how many subnetworks are active at any time. . I'm not sure if anyone has tried to determine how many useful addresses can practically exist given the current distribution of address blocks. . And with technologies such as NAT, it's reasonable that "most" devices are given dynamic addresses that are valid within their local networks but cannot be used outside their networks. So, if ten devices in ten different networks all have "192.168.1.10" assigned to them, how would they be counted? Is that just one address? . Tom
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