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Acronym for Unique Local Adressess

IPv6's answer to RFC:1918. ULA addresses are reasonably unique but only locally routable and are designed to replace SiteLocal addresses (which were deprecated in RFC:3879)

There are two competing specifications for ULA space. One has people randomly allocate addresses in a way that makes it statistically improbable that two people will generate the same address and then want to communicate. The second way has the addresses assigned "free" by a central authority thus preventing two people from using the same addresses.

The current draft ULA draft: http://people.nokia.net/hinden/draft-ietf-ipv6-unique-local-addr-09.txt

This has been announced as RFC:4193 Unique Local IPv6 Unicast Addresses