---
title: "Creating External Networks"
canonical: "https://docs.infoblox.com/space/BloxOneThreatDefense/35403573/Creating%20External%20Networks"
format: markdown
---
To create an additional external network, complete the following:

1. From the Infoblox Portal, click **Security > Configuration > External Networks**.
2. On the *External* *Networks* page, click **Create **at the top Action bar.
3. On the *Add a Network* page, complete the following:
  - **Network Name**: Enter the name of the network. Ensure that you use a unique name for each network.
  - **Description**: Enter a brief description of the network.
  - **Subnets**: Enter a valid subnet based on an IPv4 address or IPv6 address and netmask. To avoid duplicate networks and issues with ACLs defined for the DNS Firewall, Infoblox Threat Defense does not allow a CIDR block that spans a wide range of IPs. When using an IPv4 address, you can enter a valid netmask between **/24** and **/32**. When using IPv6, you can enter a valid netmask between **/32 and /128**. Infoblox Threat Defense will return an error if you enter an invalid netmask. Click **Add** to add the subnet address to the list. You can add multiple subnets by repeating the same steps. To delete a subnet from the list, select the subnet and click **Remove** located on the top Action bar.
    - IPv4 subnets larger than **/29** and IPv6 subnets larger than **/56** will be verified by the Infoblox support team prior to becoming operational.<span style="color: #ff5630"> </span>Please allow 5 business days for support team verification.
    - **Description**: Add a description of up to 256 characters for the subnet (optional). Descriptions can identify the location, purpose, or devices associated with the subnet, such as Guest Wi-Fi, IoT Devices, or New York Branch Office.
4. Click **Save & Close** to save your configuration. Infoblox Threat Defense adds the newly created network to the *Networks *list.

<span style="color: #000000">For additional information on external networks, see the following: </span>

- <span style="color: #000000">*[Configuring External Networks](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneThreatDefense/pages/35473665)*</span>
- <span style="color: #000000">*[Editing External Networks](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneThreatDefense/pages/35469309)*</span>
- <span style="color: #000000">*[Removing External Networks](https://infoblox-docs.atlassian.net/wiki/spaces/BloxOneThreatDefense/pages/35372878)*</span>