Portable Network Monitor : Look@LAN

Look@LAN is a Portable application that allows a user to monitor which clients are connected to a local network. Look@LAN will display the IP addresses of any computer attached to your local network and will determine if the machines are online or offline and can display if the computer is using a Windows operating system or not. You can limit scan ranges based on IP address, network adapter, or port types. Plus the utility ships with ping, traceroute, and a tree-based network viewer already built in.

Download Link: http://www.softpedia.com/get/Network-Tools/Network-IP-Scanner/LookatLAN.shtml