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

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