List of Authentication and Communication IPs for Messenger

We use a IM monitoring proxy server to monitor all IM traffic on our corporate network. All IM traffic goes through the proxy server and the proxy server alone access the IM providers. Once we blocked direct access to all IM providers, nobody can login to their Yahoo Messenger accounts. This is only affecting Yahoo clients. Is there a list available anywhere that differentiates between the authentication server IPs, which we can allow access to, and the communication server IPs, which we will still block so traffic goes through the monitor proxy?

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