Google IP ranges can be found by doing a DNS query:

http://support.google.com/a/bin/answer.py?hl=en&answer=60764 

the help article is specific to Google Apps email IPs but I believe 
_netblocks.google.com TXT record includes all Google IPs. Note that the 
list is not static so you'd need to regularly monitor it for changes.

I don't know if there's a way to scope that down to just the API servers 
but a Googler on the list may be able to help you there.

Jay

On Friday, April 20, 2012 4:38:33 PM UTC-4, patriciaG wrote:
>
> Forgot to mention that my app is using the gdata Java client apis to 
> access documents, calendars, sites, provisioning api. It also uses openID. 
> Thanks, 
> -Patricia 
>
> -----Original Message----- 
> From: [email protected] [mailto:
> [email protected]] On Behalf Of Patricia N Goldweic 
> Sent: Friday, April 20, 2012 3:37 PM 
> To: [email protected] 
> Subject: [google-apps-apis] subnets for Google servers? 
>
> Hi, 
> I wonder if there's a way to find out what are the specific subnets that 
> an application that contacts Google programmatically, should be able to 
> access. My app is going to be moved to a server behind a firewall and they 
> are asking me for specific subnets to allow outgoing communication to. Any 
> help will be appreciated. Thanks, -Patricia 
>
> Patricia Goldweic 
> [email protected] 
>
>
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