The 169.254 class B is assigned to IANA through
RFC 3330
Specifically:
Quote:
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169.254.0.0/16 - This is the "link local" block. It is allocated for communication between hosts on a single link. Hosts obtain these addresses by auto-configuration, such as when a DHCP server may not be found.
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Edit: It would seem as if RFC3330 is an update to RFC1918, as it includes the three well-known non-routable private networks in addition to several others.