When using a port-scanner, network scanning procedure can be conducted to identify which ip addresses belong to active hosts.
Network scanning is a procedure which is used for identifying active devices on a network by employing a feature or features in the network protocol to signal devices and await a response.
Nowadays network scanning is used in monitoring and management, but scanning can be used to identify different network elements or users for attacks.
The specific protocol features which are used in scanning depends on the network, but for IP networks scanning normally sends a simple message to each possible IP address in a specified range.
After this they uses another protocol to obtain data on the devices if a response to the ping is received.
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