rpc.rquotad is a
rpc(3) server which returns quotas for a user of a local filesystem which is NFS-mounted onto a remote machine.
quota(1) uses the results to display user quotas for remote filesystems.
rpc.rquotad is normally invoked by
inetd(8).
rpc.rquotad uses an RPC protocol defined in
/usr/include/rpcsvc/rquota.x.