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# Addresses and Identifiers settings screen details

- Addresses and Identifiers panel overview

- IPv4 Subnets and Address Ranges

- MAC Addresses

- World Wide Names

- Serial Numbers

## Addresses and Identifiers panel overview

On the Settings screen, the Addresses and Identifiers panel displays the number of currently available IPv4 addresses, MAC addresses, WWNs, and serial numbers. Click Edit in the panel to add an IPv4 subnet and address range, to autogenerate additional ID pool ranges, or to create a custom ID range.

For more information, see the following:

- Add an IPv4 subnet and address range

- Add an autogenerated ID pool for MAC addresses, WWNs, or serial numbers

- Add a custom ID pool range for MAC addresses, WWNs, or serial numbers

## IPv4 Subnets and Address Ranges

These fields apply to Add and Edit operations.

Screen component | Description
--- | ---
Subnet ID | IP address representing the network ID of the subnet.
Subnet Mask | Bitmask that characterizes the subnet in which the range belongs. It is used in conjunction with the subnet ID to determine the network routing prefix.
Gateway | IP address of the gateway.
Domain | Domain name.
DNS | IP addresses of the DNS servers. Up to 3 DNS servers are supported.
Associated Networks | Link to the associated networks. The association is between the subnet and the VLAN ID.
Address Ranges | List of address ranges.
Available addresses | Number of available addresses for the subnet.
Name | Unique name for the address range.
First IP address | Starting address in the range.
Last IP address | Ending address in the range.
Enabled | Enable or disable the address range. By default, IPv4 address ranges are enabled.
Start | A valid IPv4 address for the start of the range.
End | A valid IPv4 address for the ending of the range.
Count | Total number of addresses in the range.
Allocated | Number of addresses in use.
Available | Number of available addresses remaining.
| Edit the subnet and address range.
| Remove the range of addresses and make them unavailable. You cannot remove a range or subnet that is associated with other resources or has addresses in use.
Buttons | See Standard UI buttons for information about how the standard UI buttons operate.

## MAC Addresses

A media access control (MAC) address is a unique identifier assigned to network devices, often referred to as the hardware or physical address. The appliance generates MAC addresses in pools of 128 to 1,048,576 elements. By default, the appliance has 1,000,000 MAC addresses.

Screen component | Description
--- | ---
Enable Virtual (Edit screen) | By default, virtual addresses and identifiers are enabled so server profiles will be configured with virtual addresses and identifiers.
Type | `Generated` or `Custom` `Generated` is assigned during appliance setup. For `Custom`, you define the starting and ending addresses. There can be more than one of each type of pool; multiple autogenerated and custom pools.
Enabled | If you enable one or more virtual addresses or identifiers, a newly created server profile will be able to use them. When you disable virtual addresses, server profiles can only use physical addresses and identifiers. There must be at least one enabled pool range.
Start | Starting address in the pool. When you enable virtual addresses or identifiers, the predefined range is selected. The predefined range is large and randomly generated to prevent conflicts between profiles created in different realms. Supported MAC addresses are locally administered Unicast type addresses. Therefore, you have to set the second hex digit to an even number (2, 6, A, or E) to remain locally unique. Examples: `5E:1B:6C:80:00:00 - 5E:1B:6C:80:0F:FF` to create 4096 MAC addresses `5E:1B:6C:80:00:00 - 5E:1B:6C:80:FF:FF` to create 65K MAC addresses
End | Ending address in the pool The second hexadecimal number in a MAC address custom range must be 2, 6, A, or E to remain locally unique.
Count | Total number of addresses in the pool
Allocated | Number of addresses in use
Available | Number of available addresses remaining
Remove | Click X to remove the pool of addresses and make them unavailable. The X becomes visible when Count equals Remaining.
Add auto-generated button | Generates a pool of 1 million identifiers. Button is available only when editing.
Add custom range button | Generates a user-supplied pool of identifiers. Button is available only when editing.
Buttons | See Standard UI buttons for information about how buttons operate.

## World Wide Names

A World Wide Name, (WWN) is a unique identifier assigned to storage devices connected to a network. WWNs are generated in pools of 128 to 1,048,576 elements. By default, the appliance has 1,000,000 WWNs.

Screen component | Description
--- | ---
Enable Virtual (Edit screen) | By default, virtual addresses and identifiers are enabled so server profiles will be configured with virtual addresses and identifiers.
Type | `Generated` or `Custom` `Generated` is assigned during appliance setup. For `Custom`, you define the starting and ending addresses. There can be more than one of each type of pool; multiple autogenerated and custom pools.
Enabled | If you enable one or more virtual addresses or identifiers, a newly created server profile will be able to use them. When you disable virtual addresses, server profiles can only use physical addresses and identifiers. There must be at least one enabled pool range.
Start | Starting address in the pool. When you enable virtual addresses or identifiers, the predefined range is selected. The predefined range is large and randomly generated to prevent conflicts between profiles created in different realms. IEEE Standard WWNs are used for the WWN pool, prepending `10:00` in front of a locally-administered unicast MAC address, such that the first four hex digits of the WWN are `1000`, and the sixth hex digit is 2, 6, A, or E. Examples: `10:00:5E:1B:6C:80:00:00 – 10:00:5E:1B:6C:80:0F:FF` is a valid range of 4096 WWNs `10:00:55:1B:6C:80:00:00 – 10:00:55:1B:6C:80:0F:FF` is an invalid range of 4096 WWNs
End | Ending address in the pool The second hexadecimal number in a WWN address custom range must be 2, 6, A, or E to remain locally unique.
Count | Total number of addresses in the pool
Allocated | Number of addresses in use
Available | Number of available addresses remaining
Remove | Click X to remove the pool of addresses and make them unavailable. The X becomes visible when Count equals Remaining.
Add auto-generated button | Generates a pool of 1 million identifiers. Button is available only when editing.
Add custom range button | Generates a user-supplied pool of identifiers. Button is available only when editing.
Buttons | See Standard UI buttons for information about how buttons operate.

## Serial Numbers

Serial numbers are generated in pools of 128 to 46656 elements. By default, the appliance has 46,000 serial numbers.

Screen component | Description
--- | ---
Enable Virtual (Edit screen) | By default, virtual addresses and identifiers are enabled so server profiles will be configured with virtual addresses and identifiers.
Type | `Generated` or `Custom` `Generated` is assigned during appliance setup. Serial numbers are prefixed with `VCG`. For `Custom`, you define the starting and ending addresses. Serial numbers are prefixed with `VCU`. There can be more than one of each type of pool; multiple autogenerated and custom pools.
Enabled | If you enable one or more virtual addresses or identifiers, a newly created server profile will be able to use them. When you disable virtual addresses, server profiles can only use physical addresses and identifiers.
Start | Starting address in the pool. When you enable virtual addresses or identifiers, the predefined range is selected. The predefined range is large and randomly generated to prevent conflicts between profiles created in different realms. You can only assign a serial number with the prefix of `VCU` in order to prevent collisions with VCM and VCEM-defined ranges. Example: `VCU97JK000 – VCU97JK35R` is a range of 4096 serial numbers.
End | Ending identifier in the pool
Count | Total number of identifiers in the pool
Allocated | Number of identifiers in use
Available | Number of available identifiers remaining
Remove | Click X to remove that pool of identifiers and make them unavailable.
Add auto-generated button | Generates a pool of 46656 identifiers. Button is available only when editing.
Add custom range button | Generates a user-supplied pool of identifiers. Button is available only when editing.
Buttons | See Standard UI buttons for information about how buttons operate.

See also

- About ID pools

- Add an autogenerated ID pool for MAC addresses, WWNs, or serial numbers

- Add a custom ID pool range for MAC addresses, WWNs, or serial numbers

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About ID pools | home | View a list of active ID pools and their properties

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