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    <p>I think there is an existing question <a href="https://stackoverflow.com/questions/11475375/ip-address-for-google-cloud-messaging-server">IP address for Google Cloud Messaging server</a> and the person found out that those are not published by Google. I also tried to look for it once but couldn't find. I might be wrong but I am pretty sure they don't publish that. Maybe instead of using corporate wifi, you can use direct 3G or 4G data plan. </p> <p>In a comment on <a href="https://stackoverflow.com/questions/13264976/why-gcm-is-not-giving-push-notification-in-android-device">why GCM is not giving push notification in android device?</a> question someone has mentioned that He opened the ports 5258,29,30 and then he was able to receive the regId from GCM server behind firewall. </p> <p>Also I think the answer by @<a href="https://stackoverflow.com/users/1221571/eran">Eran</a> on <a href="https://stackoverflow.com/questions/15571576/which-port-and-protocol-does-google-cloud-messaging-gcm-use">Which port and protocol does Google Cloud Messaging (GCM) use?</a> will be of help. It says:</p> <blockquote> <p>The device accesses the GCM servers on ports 5228-5230. If your organization has a firewall that restricts the traffic to or from the Internet, you'll need to configure it to allow connectivity with GCM. The ports to open are: 5228, 5229, and 5230. GCM typically only uses 5228, but it sometimes uses 5229 and 5230. GCM doesn't provide specific IPs. It changes IPs frequently. We recommend against using ACLs but if you must use them, take a broad approach such as the method suggested in this support link.</p> </blockquote> <p>This is relevant if your device is connected to the internet via WiFi.</p> <p>Hope this helps a bit.</p> <p><strong>Update</strong>: </p> <p>As per <a href="https://stackoverflow.com/users/440921/mark-whitaker">Mark Whitaker</a> answer to a similar question <a href="https://stackoverflow.com/a/23784874/1306419">here</a>, he mentions that:</p> <blockquote> <p>Newer versions of Android also fall back to port 443 if ports 5228-5230 are blocked by a firewall. </p> </blockquote> <p>Although there doesn't seem to be an official list still.</p>
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    1. COThanks Shobhit for the summary, looks like there are no such list yet
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