Automatic Private IP Addressing
aliases:
An addressing system in place to use special IP addresses when something goes wrong with the Dynamic-Host-Configuration-ProtocolDHCP server or with the host that needs it.
APIPA addresses always begin with 169.254.x.x.
APIPA is triggered when a DHCP server takes too long to offer an IP address lease to the client.
Apparently the name APIPA is Microsoft-only. Official documentation call this protocol IPv4 Link Local (IPv4LL).