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Inbound and outbound RealTime Service (RTS) ports and needed IP addresses

Overview of inbound and outbound ports that RTS is using:

Note: The ports listed below are valid no matter where Realtime Service (RTS) is installed (on-premise or in the cloud). If installed behind a firewall, then appropriate inbound ports and outbound ports should be used for RTS to communicate with other components.

RTS = RealTime Service (Windows services)
RTM = RealTime Manager

Note: RealTime Services uses the following DNS names for communicating with Office 365, Exchange Online, Azure AD:

For Azure Cloud:


For German Cloud:


For Chinese Cloud:


Overview of needed IP addresses:

You can have an overview of IP addresses RTS is using when talking to Office 365 by visiting this page:

The above dns names are listed in the following sections:

- Microsoft 365 Common and Office Online
- Exchange Online

But as the IP addresses change frequently, we do not recommend locking down the traffic to specific addresses. Rather consider using Conditional access if this is a possibility. Or using the Json or pac file to ensure that your public firewall has the correct addresses. 

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