It should be using c2dm so it looks like the answer is 5228.

http://stackoverflow.com/questions/6106318/android-c2dm-port-number-choice


On Aug 25, 9:44 am, roddo <[email protected]> wrote:
> I'm trying to understand what network protocols the Android Gmail app
> uses for syncing in order to get the IT department at my company to
> properly configure the office firewall to permit Gmail push updates to
> work. What TCP/UDP ports are used? Is there something special that the
> firewall needs to take into account to permit Gmail syncing?

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