How to get an unused IP address

The IP address may be unfamiliar to the average user, because the average person will not easily use or study him, but if you are a webmaster, it is necessary.

As a network administrator, when we solve the DHCP failure of the Windows operating system, we sometimes find out which addresses in an address range are not used. I have previously introduced a method: open a command prompt window, call the ping command in the For…in…Do loop. For example, to find out which addresses are not used in the address range 192.168.1.1 to 192.168.1.100, you can use this command: For /L %f in (1,1,100) Do Ping.exe -n 2 192.168.1.% f

This command reports all IP addresses in the specified range. Whether it is used or not, the user has to scroll through a large amount of content in the command line window. In fact, we can avoid these troubles, just create a batch file, ask it to return only those unused IP addresses, and then enter the results of the command into a text file. Here's how to do it:

Open Notepad and type the following command in the window:

@Echo off

date /t > IPList.txt

time /t >> IPList.txt

echo =========== >> IPList.txt

For /L %%f in ( 1,1,100) Do Ping.exe -n 2 192.168.1.%%f