IP Address Block of Appengine Servers?

Question

I\'m working with a third party webservice who requires that all calls to their service are made from whitelisted IP addresses. That is, I must give them IP addresses from w

Answer 1

Please note: _netblocks.google.com is apparently not accurate. Currently I have noticed that GAE connects from addresses not listed when you dig _netblocks, for example from 8.35.201.166.

This range is not listed in _netblocks, _netblocks2 or _netblocks3.

Current dig output: ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16

Answer 2

I had the same problem a couple of weeks ago connecting via Urlfetch from Google App Engine to the Stack Exchange API (The team has promptly fixed the problem whitelisting all the GAE IPs).

The range of IP addresses that urlfetch connections may come from, can be found by performing the following DNS lookup:

dig -t TXT _netblocks.google.com @ns1.google.com 

Answer 3

Last I checked this wasn't possible. You can get the current IP address dynamically, but it isn't predictable.