The need to search for network devices can arise in a variety of cases, for example, when setting up a network or checking the security level. Knowing which devices are connected to the network gives the administrator the information he needs to plan future work.
It is necessary
special scanning programs
Instructions
Step 1
Any device connected to a network has a network IP address or MAC address. In order to test the network, special programs are used - scanners. There are a large number of such programs, but only a few of them have gained the most popularity.
Step 2
The most famous and popular scanner is nmap. The program allows you to scan a specified range of addresses, while it has a large number of settings that allow you to choose the most optimal scanning mode. It should be noted that this particular scanner is the most popular among hackers. Of the shortcomings of the scanner for an ordinary user, it can be noted that it works in console mode. True, there is also a version with a gui-interface familiar to Windows users - Zenmap.
Step 3
Download the file and run the installation of the program. After finishing the installation, launch Zenmap. In the window that opens, specify the scan target, it can be either a specific IP address or a certain range. To scan a network, you will need to specify its range to identify active devices - that is, connected to the network and having an IP address. You will also need to set scan options. Since the program has a huge number of settings for different scanning options, it is better to get acquainted with them in the reference manual.
Step 4
If you just need to check a range for the presence of running machines, use the simple but very handy Angry IP Scanner utility. On the net you can find its second and third versions, the second (for example, version 2.20) seems to be more convenient. After launching the program, specify the start and end value of the port range, and in the settings - the ports to be scanned. You can specify both a list of individual ports and a range. The program will start scanning the range, displaying the found devices in the list. Live addresses will be marked with green circles, unresponsive ones - with red ones. In the settings (Options - Options… - Only open ports) you can configure the program to display only active resources in the list. Scan results can be saved to a text file.
