With the named locations feature of Azure Active Directory, you can label trusted IP address ranges in your organizations. In your environment, you can use named locations in the context of the detection of risk events. The feature helps reduce the number of reported false positives for the Impossible travel to atypical locations risk event type.
To configure a named location:
Sign in to the Azure portal as global administrator.
In the left pane, click Azure Active Directory.
On the Azure Active Directory blade, in the Security section, click Conditional access.
On the Conditional Access blade, in the Manage section, click Named locations.
On the Named locations blade, click New location.
On the New blade, do the following:
a. In the Name box, type a name for your named location.
b. In the IP ranges box, type an IP range. The IP range needs to be in the Classless Inter-Domain Routing (CIDR) format.
c. Click Create.
What you should know
Bulk updates: When you create or update named locations, for bulk updates, you can upload or download a CSV file with the IP ranges. An upload adds the IP ranges in the file to the list instead of overwriting the list.
Limitations: You can define a maximum of 60 named locations, with one IP range assigned to each of them. If you have just one named location configured, you can define up to 500 IP ranges for it.
To learn more about risk events, see Azure Active Directory risk events.