---
title: "Create Subnets"
canonical: "https://docs.infoblox.com/space/DeploymentGuidevNIOSforOCI/1557496232/Create%20Subnets"
format: markdown
---
Infoblox vNIOS for OCI instances require two subnets, one for the LAN1 interface and one for the MGMT interface.

1. From the VCN Details page, select **Subnets** under resources.
2. Click on **Create Subnet**.

![image-20250526-083705.png](media://467554c5-03d5-43fd-8ccc-f779d67d69e9)

3. In the Create Subnet pane, enter a name for your subnet.
4. If needed, use the dropdown to select the compartment where you will create the subnet.
5. For Subnet Type, select **Regional**, unless you have a specific use case requiring otherwise.
6. Enter a CIDR Block for the subnet. For example, **192.168.1.0/25**.

*Note: This CIDR must fit inside a CIDR specified for the VCN.*

7. Use the Route Table dropdown to select a route table. If this is a new VCN, only the **Default Route Table** will be listed.
8. Under Subnet Access, select **Public Subnet**.

*Note: If you will be connecting your instance to the Grid over VPN or FastConnect, you may wish to select Private Subnet*.

![image-20250526-083739.png](media://671f5114-1b21-4249-b8c9-888673fd626b)

9. Scroll down in the pane. Use the DHCP Options dropdown to select a DHCP options set. If this is a new VCN, only the **Default DHCP Options** will be listed.
10. Use the Security List dropdown to select the Security List you configured for vNIOS.
11. Click on **Create Subnet**.

![image-20250526-083804.png](media://66088fad-a293-49f0-819a-8b632bdfdbb8)

12. Repeat steps 2-11 for a second subnet, giving it a unique name and non-overlapping CIDR.

![image-20250526-083825.png](media://8f28166c-a7d7-4a4e-9a2c-5fdb7a6320d6)