Documentation forSolarWinds

Advanced Subnet Calculator tool

The Advanced Subnet Calculator tool in ETS for the Desktop does the following to help you calculate subnet masks and manage IP addresses:

  • Breaks down the IP address
  • Performs DNS resolution
  • Offers classful subnet calculations
  • Offers classless (CIDR) subnet calculations
  • Provides a complete report of subnet addresses based on calculations

See the following sections:

Open the Advanced Subnet Calculator tool

  • To launch the tool from the Toolset Launch Pad, locate the Advanced Subnet Calculator tool and click Launch.

  • You can add the tool to a tab in the Workspace Studio, and access it from there.

  • To launch the tool from the Windows Start menu:

    1. Click Start > All > SolarWinds Engineer's Toolset.

    2. Right-click Advanced Subnet Calculator, click More, and click Run as administrator.

Look up address details

From the Address Details tab, you can execute forward and reverse DNS look ups, ping IP addresses, and convert them to hex and binary.

IP address Enter an IP address and click Lookup host name to look up the DNS name of the IP address. The tool also pings the target and calculates the response time.
host name Enter a host name and click Lookup IP address to look up the IP address. The tool also PINGs the target and calculates the response time.
Response Time Provides the response time for the IP address or host name.
Hex Provides the hex equivalent of the IP address.
Binary Provides the binary equivalent of the IP address.
Address Owner or Info Provides a complete DNS Resolution of the owner of the IP address and bit template.
Copying to the clipboard Click Copy Details to copy the current information to the clipboard.

Classful Subnet Calculator

From the Classful Subnet Calculator tab, you can generate a list of subnets based on a number of different parameters.

The classful approach to masking is achieved by adhering to the following standard classes:

  • Class A: 255.0.0.0 - 11111111.00000000.00000000.00000000
  • Class B: 255.255.0.0 - 11111111.11111111.00000000.00000000
  • Class C: 255.255.255.0 - 11111111.11111111.11111111.00000000

The following information is calculated after entering an IP address:

  • Subnet
  • Mask
  • Inverse mask
  • Subnet size
  • Host range
  • Broadcast
IP address The IP address you specify is used as a base address when calculating subnets. To calculate a list of subnets, click Generate Subnets.
Subnet Mask The subnet mask used when generating a list of subnets. The subnet mask automatically adjusts when you change any other parameters.
Mask Bits Number of network (or mask) bits used when generating a subnet list. The number of mask bits automatically adjusts when you change any other parameter.
Host Bits Number of host bits used when generating a list of subnets. The number of host bits automatically adjusts when you change any other parameters.
Number of Subnets Number of subnets that can be generated based on the subnet mask. The number of subnets automatically adjusts when you change any other parameters.
Hosts per Subnet Number of hosts within each subnet, based on the subnet mask. The number of hosts automatically adjusts when you change any other parameters.
Subnet Bit Mask Mask template for the current subnet mask.

CIDR Calculator

Classless Inter Domain Routing (CIDR) provides a flexible method to allocate and specify IP addresses used in inter-domain routing compared to the original system of classful IP address assignment. As a result, the number of available addresses has been greatly increased. CIDR is now the routing system used by virtually all gateway hosts on the backbone network of the Internet. Many small companies also benefit from CIDR in that four class Cs can be grouped into one subnet to provide over 1,000 IP addresses.

Subnet addresses

On the Subnet Addresses tab, you can generate a worksheet of IP addresses for any subnet. Notes for each IP address can be added in the Notes column. These notes are printed or exported when the list of IP addresses is printed or exported.

IP address

Enter an IP address here. This IP address is used as the subnet address when generating a list of IP addresses.

Click Generate Addresses to generate a list of IP addresses for the subnet.
Subnet Mask The subnet mask used when generating a list of IP addresses.

Copy to the clipboard

To copy the list of IP addresses to the clipboard, click Copy.

Export, print, and copy calculations

After calculating information, you can transfer that information to other tools through exporting and copying and pasting capabilities. You can also print calculated information.

To export calculations, click File > Export, and then select the type of export.

To copy calculations, click Edit, and then select the information to copy. The selection changes based on the tab you select.

To print calculations, click File > Print.