The rpcinfo command

rpcinfo is a shell command that reports current RPC registration information known to rpcbind (and can be used, by administrators, to delete registrations). rpcinfo can be used to find all the RPC services registered on a specified host and to report their universal addresses and the transports for which they are registered. It can also be used to call (ping) a specific version of a specific program on a specific host using a TCP or UDP transport, and to report whether a response is received. For details, see rpcinfo(1tcp).