<P> A unique local address (ULA) is an Internet Protocol version 6 (IPv6) address in the address range fc00:: / 7 . Its purpose in IPv6 is analogous to IPv4 addressing in private networks . Unique local addresses may be used freely, without centralized registration, inside a single site or organization or spanning a limited number of sites or organizations . They are routable only within the scope of such private networks, but not in the global IPv6 Internet . </P> <P> In 1995, the IPv6 address block fec0:: / 10 was reserved for site - local addresses, that could be used within a "site" for private IPv6 networks . However, insufficient definition of the term site led to confusion over the governing routing rules . </P>

Are ipv6 unique local unicast addresses routable within and outside an organization