How to find a spare IP address or block of IP addresses for your IP Equipment / Resolve IP Conflict

When installing any new piece of IP equipment on any network it is important to check for possible IP conflicts and find a spare IP address or block of IP addresses to use for your equipment.

IP conflicts occur when 2 or more devices have been allocated the same IP address on one network. When an IP conflict is in existence you will notice both devices with conflicting IP address will behave erratically. If pinged, slow or erratic ping responses may be experienced as well as general device unresponsiveness.

To help avoid an IP conflict please follow this quick guide:

1) Look in the device's manual and find the default IP address of the equipment you are adding to the network and make a note of this.

2) Look up the current IP range of your network.

Here is a guide showing the process in Windows 7

Click on the Windows Symbol in the bottom left hand side of the screen. In the 'Search programs and files' bar type:


In the new Command windows type:


Make note of the IPv4 Address.


Now check to see if your current IP address range and the default IP address range of your new devices are the same.

If the address are different you are free to plug the devices in to your network and configure the device using the official configuration process.

If your new devices default IP address are in the same range as your current IP range there is a small change you could attach your new devices and get an IP conflict. To avoid this follow the steps below.

Download an IP scanning tool. To do this, simply go to Google and type: ip scanning tool

LILIN Recommend IP scanning tools are:


Follow the simple instructions for which ever scanning tool you download, these tools are usually very easy to use. The end result should look something like this.


This picture shows all reserved and available IP addresses on the network. You need to compare the list of default IP address for your new equipment against the list shown in the software. If any IP addresses conflict, there are a few steps you can take.

1) Turn off the device that already has the IP address assigned to it. Turn it back on once all new devices have had their default IP address changed.

2) Change the IP address of the device that will cause the IP conflict on the network.

3) Set the device with the conflicting IP address to DHCP. Turn that device off and then back on again. This will now be issued an IP address in the DHCP range.

To resolve an IP conflict

Power both conflicting devices off.

Apply power to one of the conflicting devices. Follow the devices recommended process for changing its IP address. Follow the guide above to find a new unused IP address on your network.

Apply power to the other conflicting device. This devices will no longer be conflicting if the IP address change above has been made correctly.

Both devices should now be working correctly and IP conflict free.

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