You can create, delete, and edit Geographic, CIDR, or Autonomous System (AS) maps. From within each specific type of map you can add, edit, or delete zones.

Geographic Maps

Geographic Maps let you configure a property that returns a CNAME based on the geographic location of the request. You can reuse maps for multiple properties or create new ones. The minimum number of map definitions is two so that.

At least one maps one or more countries to a data center.
One routes all other traffic

A Geographic Map lets you split the world into several geographic zones. Properties that use the map can specify a handout CNAME for each zone on the property's editing page.

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To configure a property for Geographic Maps, your domain must have at least one Geographic Map defined.

CIDR Maps

Classless Inter-Domain Routing (CIDR) Maps uses the IP addresses of the requesting nameserver to provide IP-specific CNAME entries, allowing you to direct internal users to a specific environment or direct to the origin. Providing different responses to an internal corporate DNS infrastructure, such as internal test environments and another answer for all other name servers, is a common use for CIDR Maps.

CIDR Maps split the Internet into multiple CIDR-block zones. Properties that use a map can specify a handout CNAME for each zone on the property's editing page.

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To configure a property for CIDR Maps, your domain must have at least one CIDR Map defined. Because GTM nameservers accept connections over both IPv4 and IPv6, you may need to add both IPv4 and IPv6 CIDRs to your map to achieve desired functionality.

AS Maps

AS Maps let you configure a property that returns a CNAME based on the AS number of the IP address of the requester. You can reuse maps for multiple properties or create new ones.

AS Maps split the Internet into multiple AS block zones. Properties that use AS Maps can specify handout integers for each zone. AS Maps let you configure a property that directs users to a specific environment or to the origin.

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To configure a property for AS Maps, you must define at least one AS Map for your domain.

Add a map

When you add a map, a template of a zone (Geographic, CIDR, or AS) is automatically created, however, you need to fill in the specific information for your type of map and zone. The steps are very similar with some differences.

Log in to Control Center.
Go to ☰ > DNS SOLUTIONS > Global Traffic Management. The Traffic Management Domains page opens.
From the Traffic Management Domains page, select the domain you want to make changes in. This opens up the Properties tab automatically.
Click the tab of the type of map you want to add, Geographic, CIDR, or AS map. The map page opens.
Each page has a Add button for the type of map. Click the respective Add New Geographic Map, Add New CIDR Map, or Add New AS Map button. The New Map page opens.
Depending on the type of map you are adding, follow these steps.

Type of map	Steps
Geographic Maps	a. In the Map Name field, enter the map a name. b. Select Geographic areas using the Search field or by checking the checkbox next to a location. Click the Plus (+) sign to expand the list of locations. c. In Geographic Zones, add a name in the Name field. d. Click Add to add the selected Geographic Areas. If you would like to remove any locations highlight it within the intended zone box, and click Remove.
CIDR Maps	a. In the Map Name field, enter the map a name. b. In the CIDR Blocks field, specify CIDR Blocks for each CIDR Zone. Add the CIDR blocks you would like to include. Separate multiple CIDR blocks with comma, semicolon, space, or a line break.
AS Maps	a. In the Map Name field, enter the map a name. b. In the AS Numbers field, specify AS numbers you would like to include in the zone. Separate multiple AS Numbers with comma, semicolon, space, or a line break.

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You can add zones if they already exist, or you can edit the map later by adding any additional zones.

When you are finished, click Add to Change List.

Your map appears in the table under the map tab. To activate these changes to your domain, follow the steps in Activate domain changes in Manage GTM domains.

Delete a map

From the Traffic Management Domains page, select the domain you want to make changes in. This opens up the Properties tab automatically.
Choose the type of map that you want to work with.
Click a map from the list.
Under Actions, click the ellipsis.
When the menu appears, click Delete.
The map remains in the list with a line through it.
To finish deleting the map, follow the steps in Activate domain changes in Manage GTM domains.

Edit maps (create zones)

From the Traffic Management Domains page, select the domain you want to make changes in. This opens up the Properties tab automatically.
Click the tab for the map you are working with.
Click a map from the list. This can be the map that you just created, or another preexisting map.
If you are adding a new zone, click Add... zone. Each page has the type of zone in the button. An empty zone box appears, ready to be filled in. If you are editing a preexisting zone, skip this step.
Depending on which kind of zone you are working with, follow these steps.

Type of map	Steps
Geographic Maps	a. In the Map Name field, enter the map a name. b. Select Geographic areas using the Search field or by checking the checkbox next to a location. Click the Plus (+) sign to expand the list of locations. c. In Geographic Zones, add a name in the Name field. d. Click Add to add the selected Geographic Areas. If you would like to remove any locations highlight it within the intended zone box, and click Remove.
CIDR Maps	a. In the Map Name field, enter the map a name. b. In the CIDR Blocks field, specify CIDR Blocks for each CIDR Zone. Add the CIDR blocks you would like to include. Separate multiple CIDR blocks with comma, semicolon, space, or a line break.
AS Maps	a. In the Map Name field, enter the map a name. b. In the AS Numbers field, specify AS numbers you would like to include in the zone. Separate multiple AS Numbers with comma, semicolon, space, or a line break.

After you're done making changes, click Add to Change List to save. This returns you to the main maps page.