rpcinfo-diff is a patch for the netkit version 0.17 rpc package, allowing a target port to be set for rpcinfo. This is useful for targeting older sun machines, which run rpcbind on a udp port greater than 32770.
You can download it from the following link: https://packetstormsecurity.com/files/download/25028/rpcinfo-diff
Source: https://packetstormsecurity.com/files/25028/rpcinfo-diff.html