How many IP addresses does a subnet of 10.16.0.0/30 have?

Question

BlackTom AI · Accepted Answer

We start by identifying what a /30 subnet means in IPv4 addressing. A /30 indicates that the first 30 bits of the 32-bit IP address are fixed for the network portion, leaving 2 bits for host addresses.

Option 1: 4
This is the correct total number of IP addresses in a /30 subnet, since 2 bits for hosts yield 2^2 = 4 possible addresses (network address, two usable host addresses, and broadcast address).

Option 2: 16
If there were 16 addresses, that would correspond to 4 host bits (2^(32-28) = 16), which would mean a /28 subnet, not /30. The prefix length would be 28, not 30.

Option 3: 64
Sixty-four addresses come from 6 host bits (2^(32-26) = 64), corresponding to a /26 subnet. Again, this does not match a /30 prefix length.

Option 4: 256
Two hundred fifty-six addresses arise from 8 host bits (2^(32-24) = 256), which is a /24 subnet. This would be a much larger network than /30.

In summary, the /30 prefix leaves 2 host bits, giving 2^2 = 4 total IP addresses, matching the first option.

How many IP addresses does a subnet of 10.16.0.0/30 have?

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