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 private network addressing. 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.