HB Blog 130: How To Scan Network With Nmap GUI.

Nmap is popular network scanner software that can actively probe a particular host or a network to infer in-depth information about them. Nmap can conduct host discovery, service detection, OS version identification, port scanning, network stack fingerprinting, etc. It will help you to discover hosts, protocols, open ports, services and its configuration and vulnerabilities on networks. While Nmap itself is a command-line utility, you can run it along with its GUI front-end called Zenmap. Network Mapper is an Android frontend for well known Nmap scanner. Frontend will help you to download and install Nmap as well as use it. Frontend supports all known Android architectures: arm, mips and x86. Nmap binaries are transferred using HTTPS by default.

In this tutorial, I will describe how to scan particular hosts or networks by using Nmap GUI.
The following screenshot shows the main window of Zenmap.

Scan Particular Host(s):-
Using Zenmap interface, you can probe a particular host. Fill in the IP address or host name of a destination host in "Target" field, and choose a desired scan profile from "Profile" drop down menu. Then, click on "Scan" button. For multiple hosts, you can specify them in a comma-separated list.
To check the detailed system information of a particular host after scanning, highlight a host in the left panel, and click on "Host Details" tab on the right panel.

To view available services and open ports of a host, click on "Ports / Hosts" tab.

Scan an Entire Network:-
Zenmap can also probe an entire local network by specifying an address prefix (e.g., 192.168.1.0/24) in the "Target" field.
Once network scanning is completed, you can view the topology of discovered hosts by clicking on "Topology" tab.

To view a list of available services, click on "Services" button on the left panel. You can see a list of all discovered services and their associated hosts, as shown below.