A Windows Sockets 2 clearinghouse has been established for service provider vendors to obtain unique identifiers for new address families, socket types, and protocols. FTP and world-wide web servers are used to supply current identifier/value mappings, and email is used to request allocation of new ones. At the time of this writing the world-wide web URL for the Windows Sockets 2 Identifier Clearinghouse is
http://www.stardust.com/wsresource/winsock2/ws2ident.html