Nmap A command-line utility that includes a range of network management tools, including IP address management features and a port scanner. ManageEngine OpUtils – FREE TRIAL A package of free network monitoring tools that includes a Ping-based network scanner, and a MAC address resolver. Start a 30-day free trial and get unlimited free use for up to 100 sensors. Paessler PRTG – FREE TRIAL This package of monitoring for networks, servers, and applications includes an IP scanner and is free to use. SolarWinds Open Port Scanner with Engineer's Toolset – EDITOR'S CHOICE This port scanner is part of a suite of more than 60 network management tools and is very easy to use. Here is our list of the eleven best free IP and Port Scanners for open ports, IP addresses and service scanning: Port Scanning software helps managers, testers, and hackers create a profile and gain intelligence about a target organization all while ensuring Access to critical systems and services are managed correctly. It basically helps identify open and vulnerable ports and protocols that are being used in the network. When testing security, or even hacking, port scanning becomes one of the most essential steps of a successful network exploration. 
The network reconnaissance is basically identifying live hosts and scanning ports and services.
It can also allow managers to maintain a detailed and updated diagram of the network. Doing a Network Reconnaissance helps network managers improve security by identifying weak devices that can be potentially breached.
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