How can you tell which IP addresses on your network are free and which are in use?

How can you tell which IP addresses on your network are free and which are in use?

Here we can see, “How can you tell which IP addresses on your network are free and which are in use?”

A network’s foundation is IP addresses. Every device in a network has its IP address, which it uses to communicate with other devices in the network. IP addresses make it easy for network administrators to know what devices are connected and doing. As a result, the overall performance of the network can be improved.

You’ll also be informed of any IP addresses that have been misallocated, allowing you to conserve bandwidth. We’ll utilize the Solarwinds Engineers Toolset to accomplish this and locate free and in-use IP addresses in a network.

Download the Ping Sweep Tool

SolarWinds Engineers Toolset includes a tool called Ping Sweep (download here). In addition, ETS consists of several networking tools that allow IT administrators to monitor, manage, and troubleshoot their networks.

We’ll be using one of the tools included with the Solarwinds Engineers Toolset program for this lesson, so you’ll need to download and install it (from the link supplied).

What is Ping Sweep?

A ping sweep is a method for determining a range of IP addresses corresponding to live hosts in computing. The classic ping sweep tool is fping, which was typically used in conjunction with gping to generate a list of hosts for large subnets, although more recent versions of fping now incorporate that functionality.

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The Solarwinds Engineers Tool includes a tool called Ping Sweep. It allows you to send several packets to your network simultaneously, search your provided IP range for free, and utilize IP addresses using a rapid ICMP sweep. For example, you can use Ping Sweep to find out which IP addresses are available and which ones are used and search out their DNS names. After you’ve finished scanning your IP range, you can export the findings in various formats, including CSV, TXT, and XLS.

How can I find IP addresses that are both free and in use?

  1. Open the Engineers toolset launch pad by going to the Start Menu and looking for Toolset LaunchPad.
  2. After that, you’ll need to launch the Ping Sweep application. To do so, either type Ping Sweep into the search box on the left-hand side or go to Network Discovery on the left-hand side and select the Ping Sweep Launch button.
  3. After the utility has started, you must specify the IP range you want to scan.
  4. In the field provided, type the IP address range. If you want to do some troubleshooting, you may next search for responding or non-responding IP addresses. Alternatively, you may select All to have it search for both.
  5. IP addresses can also be imported from.txt (text document) files. As shown in the instructions, you can use the hash (#) to add comments for each IP address range.
  6. Finally, when you’re ready, press the Start Ping Sweep button to begin scanning.
  7. If you choose, you can export the results after the scan is completed.
  8. Click the drop-down button to the left of the minimize symbol to do so. Then choose Export Table from the drop-down menu. Please select the format you want to save it in and the columns and rows you want to export in the new window that appears. After that, choose OK.
  9. Finally, select a location to save the findings and click Save.


I hope this information was helpful to you. If you have any questions or comments, please use the form below.

User Questions:

How do you figure out what IP addresses are being used?

  • Type ipconfig on Windows or macOS, or ifconfig on Linux.
  • To receive a list of all other IP addresses active on your network, type arp -a.

What network device has that public IP address?

Your router is immediately connected to the Internet and has your public IP address issued to it (which may change over time). Your router is then in charge of distributing your public IP address to the rest of your home’s PCs and connected gadgets. Local IP addresses are assigned to your connected devices by your router.

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What is the best way to identify an unrecognized device on my network?

  • Select About Phone or Device from the drop-down menu.
  • Select Status or Hardware Information from the drop-down menu.
  • To find your Wi-Fi MAC address, scroll down.

What is the best way to locate devices on my network?

Select Settings > Discovery > Network Discovery from the drop-down menu. Choose the method you wish to find the devices (IP Address, IP Range, or CSV file). Provide the device’s IP address, or the device’s IP range, based on your choices, or browse and pick the CSV file from which you want to discover the devices.

How can you tell whether an IP address is public or private?

You can use to see if your IP address is public (or any similar service). The IP address used to visit the site will be displayed; if it matches the IP address provided to you by your Internet service provider, you have a public IP address.

What is the best way to find all of the IP addresses on my network?

  • For Mac, type “ipconfig” and for Linux, type “ifconfig.”
  • Then type “arp -a” into the command prompt.
  • Input the command “ping -t” if desired.