On my system (Debian) it's ports 111 (rpc) and 2049 (nfs), both UDP and TCP
Also, let me give you a hint. When you have this kind of doubts, you may check on which ports different applications are listening by issuing the follwoing commands:
sudo ss -lntp sudo ss -lnup
The flags work like this:
-l list listening sockets -n do not resolve service names -t list TCP sockets -u list UDP sockets -p show the process using the socket