What are the MINIMUM ports required for UDP?

I only need to use UDP protocol, so I wanted to know what are the exact ports needed for that, according to the docs, looks like only three are needed:
5055  UDP  Client to Master Server (UDP)
5056  UDP  Client to Game Server (UDP)
5058  UDP  Client to Nameserver (UDP)

Am I right, or should I add another one?
Thanks.