---
title: "Configuring IPv4 Address Ranges"
canonical: "https://docs.infoblox.com/space/nios85/35418512/Configuring%20IPv4%20Address%20Ranges"
format: markdown
---
In a network, you define address ranges from which the DHCP server or failover association assigns IP addresses to client requests. When a DHCP client requests an IP address, the appliance allocates an address within a defined DHCP range. The DHCP client can use the assigned IP address until the lease expires.
When you do not assign a DHCP server or failover association to an address range, the range becomes a reserved range. A reserved range contains IP addresses that are reserved for static hosts, not for dynamic assignments. You can allocate the next available IP from a reserved range.
You can also apply filters to DHCP ranges to control how the DHCP server allocates IP addresses. For information about DHCP filters, see *[Configuring](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35848377)**[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35848377)**[DHCP](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35848377)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35848377)*[Filters](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35848377)*.
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Adding IPv4 Address Ranges
To add an IPv4 address range:
1. Navigate to the IPv4 network to which you want to add an address range, and then select **Range** from the Add drop down menu.
or
From any panel in the DHCP tab, expand the Toolbar and click **Add** -> **Range** -> **IPv4**.
2. In the *Add** IPv4** Range* wizard, select one of the following and click **Next**:
- **Add**** Range**: Select this to add an address range from scratch.
or
- **Add**** Range**** Using**** Template**: Click **Select**** Template** and select the template that you want to use. Note that when you use a template to create an address range, the configurations of the template apply to the new range. The appliance automatically populates the range properties in the wizard. You can then edit the pre-populated properties.
3. Complete the following:
- **Network**: Click **Select**** Network**. Grid Manager displays the network address here if you have only one network configured. When there are multiple networks, Grid Manager displays the *Select** Network* dialog box from which you can select one.
- **Start:** Enter the first available IP address in the range.
- **End:** Enter the last available IP address in the range.
- **Name:** Optionally, enter a name for the range.
- **Comment:** Enter additional information about the address range.
- **Disabled for DHCP:** Select this if you want to save the configuration for the address range but do not want to activate the address range yet. You can clear this checkbox when you are ready to allocate addresses from this range.
The **Cloud** section appears when the Cloud Network Automation license is installed on the Grid Master. For information, see *[Deploying](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[Cloud](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[Network](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*[Automation](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35881011)*. To delegate authority for this range, complete the following:
**Delegate**** authority ****from ****the ****Grid**** Master**
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4. Click **Next** and select one of the following:
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5. Click **Next** to configure or override DHCP options as described in *[Defining](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[IPv4](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[DHCP](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[Options](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)*[.](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35946818/About+IPv4+DHCP+Options#AboutIPv4DHCPOptions-bookmark2266)
> ⚠️ **Note**
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> ⚠️ Steps 6-7 apply only in deployments using Network Insight discovery features. Otherwise, skip to Step 8.
6. Click **Next** to initiate or disable discovery of the new DHCP range.
7. Discovery settings include the following: **Enable**** Discovery** and **Immediate**** Discovery**, selecting a Probe member to perform the discovery; and **Polling**** Options**, which define how the network will be discovered by the Probe member. By default, all Polling Options discovery settings are inherited from the parent network unless you click **Override**. Polling Options govern the protocols used to query and collect information about the network devices being discovered. For more information, see the section *[Configuring](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716)*[Discovery](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716)*[Properties](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35752716) for a complete description of discovery Polling Options.
8. Click **Next** to enter values for required extensible attributes or add optional extensible attributes. For information, see *[Using](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)*[Extensible](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)*[Attributes](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)*[.](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35448912/Managing+Extensible+Attributes#bookmark868)
9. Save the configuration and click **Restart** if it appears at the top of the screen
or
Click the Schedule icon at the top of the wizard to schedule this task. In the *Schedule**Change* panel, enter a date, time, and time zone. For information, see *[Scheduling](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*[Tasks](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*.
For information on viewing address ranges in a network, see *[Viewing](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[IPv4](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[DHCP](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*[Objects](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35850146)*.
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Modifying IPv4 Address Ranges
You can modify settings for the DHCP range. You can also define an exclusion range to prevent the appliance from assigning the addresses in the exclusion range to clients. IP addresses in an exclusion range are excluded from the pool of IP addresses. For more information, see *[About](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35979518/Managing+DHCP+Data#ManagingDHCPData-bookmark2205)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35979518/Managing+DHCP+Data#ManagingDHCPData-bookmark2205)*[Exclusion](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35979518/Managing+DHCP+Data#ManagingDHCPData-bookmark2205)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35979518/Managing+DHCP+Data#ManagingDHCPData-bookmark2205)*[Ranges](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35979518/Managing+DHCP+Data#ManagingDHCPData-bookmark2205)*.
To modify an IPv4 address range:
1. From the **Data****Management** tab, select the **DHCP** tab -> **Networks** tab -> **Networks** section -> *network* -> *addr_range* checkbox, and then click the Edit icon.
2. The *DHCP**Range* editor contains the following basic tabs from which you can modify data:
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3. Optionally, you can click **Toggle**** Advanced ****Mode** to display the following tabs from which you can modify advanced data.
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4. Save the configuration and click **Restart** if it appears at the top of the screen.
or
Click the Schedule icon at the top of the wizard to schedule this task. In the *Schedule **Change* panel, enter a date, time, and time zone. For information, see *[Scheduling](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*[ ](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*[Tasks](https://infoblox-docs.atlassian.net/wiki/spaces/nios85/pages/35446174)*.
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Controlling Lease Assignments
You can set parameters to control how the DHCP server responds to lease requests within a specific DHCP range. When you set a DHCP range to deny all leases requests, the appliance does not assign IP addresses within this range to DHCP clients. This is useful when you want DHCP clients with IP addresses within this range to obtain new IP addresses when they renew their leases. When a client with an IP address within this range broadcasts a DHCPREQUEST message for its old IP address, the authoritative DHCP server responds with a DHCPNAK. This causes the client to move to the INIT state and to send a DHCPDISCOVER message for a new IP address.
You can also configure the DHCP server to assign or deny IP addresses within a DHCP range to known and unknown DHCP clients. Known clients include roaming hosts and clients with fixed addresses or DHCP host entries. Unknown clients include clients that are not roaming hosts and clients that do not have fixed addresses or DHCP host entries.
To control how the appliance assigns leases to client requests:
1. **DHCP** **Range**: From the **Data** **Management** tab, select the **DHCP** tab -> Networks tab -> Networks -> network ->* addr_range* checkbox, and then click the Edit icon.
2. In the *IPv4* *Range* editor, click **Toggle** **Advanced** **Mode** if the editor is in basic mode. When the additional tabs appear, click the **IPv4** **DHCP** **Options** tab -> **Advanced** tab and complete the following:
> ⚠️ **Note**
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> ⚠️ The **IPv4** **DHCP** **Options** tab is enabled when you select a **Grid** **Member** or **IPv4** **DHCP** **Failover** **Association** in the **Member** **Assignment** tab.
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3. Save the configuration and click **Restart** if it appears at the top of the screen.
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Deleting IPv4 Address Ranges
To delete a DHCP range:
- From the **Data** **Management** tab, select the **DHCP** tab -> **Networks** tab -> **Networks** section -> *network* ->* addr_range* checkbox, and then click the Delete icon.