To register a protocol specification, send a request by email to email@example.com, or write to: RPC Administrator, Sun Microsystems, 4150 Network Circle, Santa Clara, CA 95054.
Include a compilable rpcgen .x file describing your protocol. You are given a unique program number in return.
You can find the RPC program numbers and protocol specifications of standard RPC services in the include files in /usr/include/rpcsvc. These services, however, constitute only a small subset of those that have been registered.