Which of the following addresses is not an RFC1918 address?

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BlackTom AI · Accepted Answer

To determine which address is not RFC1918, I will first recall the three private IPv4 ranges defined by RFC1918: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Each option will be checked against these ranges.
Option 192.168.17.2: This address is in the 192.168.0.0/16 block, which is a designated private RFC1918 range. Therefore, this is an RFC1918 address and not the correct choice for 'not RFC1918'.
Option 172.32.2.254: The 172.16.0.0/12 range covers 172.16.0.0 through 172.31.255.255. The address 172.32.2.254 lies just outside this private block, starting at 172.32.0.0. Since it falls outside the RFC1918 private range, it is not an RFC1918 address.
Option 10.11.11.1: This address belongs to the 10.0.0.0/8 private range, which is explicitly RFC1918 private space. Hence it is an RFC1918 address.
Option 172.31.254.128: This is within the 172.16.0.0/12 private range (172.16.0.0–172.31.255.255). Therefore, it is RFC1918 private.
Option 192.168.112.254: This falls within 192.168.0.0/16, so it is a private RFC1918 address.
Option 172.30.100.24: Also within the 172.16.0.0/12 range, making it RFC1918 private.
Option 192.168.168.10: This is another address in 192.168.0.0/16, thus RFC1918 private.
In summary, among the listed options, the only address that does not reside in any RFC1918 private block is 172.32.2.254, because it is outside the 172.16.0.0/12 range. All other addresses fall within one of the RFC1918 private ranges.

CSE 4471 AU2025 (5629) Exam 1 - Requires Respondus LockDown Browser

Which of the following addresses is not an RFC1918 address?

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