APIPA (Automatic Private IP Addressing) is a Microsoft Windows feature used when a DHCP server cannot be contacted, the computer will automatically assign itself an address in the 169.254.0.0/16 range. This is known as Link-Local in IPv6.
In a computer network, a link-local address is a network address that is valid only for communications within the network segment or the broadcast domain that the host is connected to. Link-local addresses are most often assigned automatically through a process known as stateless address autoconfiguration or link-local address autoconfiguration.Link-local addresses are not guaranteed to be unique beyond their network segment, therefore routers do not forward packets with link-local addresses.
Link-local addresses for IPv4 are defined …