The number of available IPv4 addresses is rapidly shrinking down to zero. IPv4, which uses an address space of 32-bits (four bytes, as in 255.255.255.255), is expected to be exhausted by Wednesday afternoon. Not to worry though, as IPv6, which has a whopping 128-bits of address space (8 x 16-bit words), is already deployed and is expected to be tenable for considerably longer.
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