When a computer that is configured to obtain an IPv4 address automatically cannot reach a DHCP server, from which address range will it most likely self-assign an address (APIPA/link-local)?
192.168.0.0 through 192.168.255.255
10.0.0.0 through 10.255.255.255
169.254.1.0 through 169.254.254.255
172.16.0.0 through 172.31.255.255
Automatic Private IP Addressing (APIPA) uses the link-local block 169.254.0.0/16. However, RFC 3927 reserves the first and last /24 networks, so operating systems actually select addresses from 169.254.1.0 through 169.254.254.255. If you see an address in this range, it indicates the host could not contact a DHCP server and has self-configured for local-only communication. Other private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are not used automatically; they must be assigned manually or by DHCP.
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