Microsoft uses three categories for Office 365 network endpoints with different requirements: Optimize, Allow, and Default. For the Default category, in order to minimize network optimization change management work required, we are replacing IP addresses with URLs. This includes removing the IP addresses previously listed for Yammer.
Read more about Office 365 network endpoint categories at http://aka.ms/pnc.
Yammer is changing the IP addresses it uses as of October 22, 2018. If you used IP Addresses for Yammer endpoints, in order to prevent Yammer from being blocked in your organization, you need to remove the Yammer IP addresses and add *.yammer.com.
Keep up with monthly updates for Office 365 IP Addresses and URLs at http://aka.ms/o365ip.
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