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Home > Success Center > IP Address Manager (IPAM) > IPAM Administrator Guide > IP Address Monitoring with IPAM > Organize an IP address space into subnets

Organize an IP address space into subnets

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Created by Nanette.Neal, last modified by Nanette.Neal on Jul 15, 2016

Views: 196 Votes: 0 Revisions: 2

Orion IPAM provides the Subnet Allocation Wizard to help you efficiently organize your managed IP address space into subnets that are sized appropriately for the extent and traffic of your network. With its real-time subnet calculator, the Orion IPAM Subnet Allocation Wizard allows you to quickly determine the most efficient way to subdivide any supernet, as shown in the following procedure.

To create subnets from supernets using the Subnet Allocation Wizard:

  1. Click IP Address Manager in the Menu bar.
  2. Click Manage Subnets & IP Addresses.
  3. In the network tree pane on the left, click Add > Subnet Allocation Wizard.
  4. Enter the address of the supernet to divide in the Supernet Address field.
  5. Select an appropriate CIDR prefix length.

    Orion IPAM instantly confirms the validity of provided the Supernet Address and CIDR prefix length combinations. For more information about CIDR, see Networking Concepts and Terminology.

  6. Select the Desired Subnet Size.

    Typically, in subnets defined to contain more than 2 IP addresses, the first and last addresses are reserved as the network address, for identifying the subnet to the rest of the network, and the broadcast address, for communicating with all addresses within the subnet, respectively. As a result, the number of available IP addresses is always two fewer than the number actually contained within a given subnet.

  7. If you only want to see subnets that have already been allocated, clear Show subnets not already allocated.
  8. Click Refresh to display a list of all possible subnets that may be allocated, based on your provided criteria.
  9. Check the subnets you want to manage in Orion IPAM, and click Next.
  10. If you want to view the subnets you are currently adding, click + next to the XX Selected Subnets header.
  11. If you do not want to keep the supernet you used on the previous view to define the subnets you are adding, clear Add Supernet  X.X.X.X /X.

    By default, Orion IPAM adds the supernet you used to define your subnets to make it easier to organize your network. Although it is optional, SolarWinds recommends that you check this option and use the supernet unless you are only adding a few subnets.

  12. If you do not want to organize your added subnets into the smallest available supernet, clear Move newly added subnets into smallest appropriate supernet.

    Adding subnets either to an existing supernet or to a newly defined supernet can make it easier to organize your network. Although it is optional, SolarWinds recommends that you check this option and keep the supernet unless you are only adding a few subnets.

  13. If you want to further identify your new subnets, provide a Description, VLAN ID, or Location for the new subnets.
  14. If you do not want Orion IPAM to automatically scan your new subnets for changes, check Disable Automatic Scanning.
  15. If you want Orion IPAM to automatically scan your new subnets for changes, use the slider to set the Scan Interval.
  16. Click Done when you have completed configuring your new subnets.
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