A Windows computer that is configured for DHCP will automatically assign itself an Automatic Private IP Addressing (APIPA) address if it cannot reach a DHCP server. From which IPv4 address block does Windows select an APIPA address?
192.168.0.0 - 192.168.255.255
169.254.1.0 - 169.254.254.255
169.254.0.1 - 169.254.255.254
10.0.0.0 - 10.255.255.255
APIPA uses the IANA-reserved 169.254.0.0/16 link-local block, but RFC 3927 reserves the first 256 addresses (169.254.0.0/24) and the last 256 addresses (169.254.255.0/24). Windows therefore chooses an address between 169.254.1.0 and 169.254.254.255 and assigns the subnet mask 255.255.0.0. This allows limited communication with other devices on the same subnet until a DHCP lease can be obtained. The other ranges listed are either the full /16 (including the reserved portions) or private-network blocks that are not used by APIPA.
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