From Northwest Performance Software:
NetScanTools Pro is an integrated collection of internet information gathering and network troubleshooting utilities for Network Professionals. Research IPv4/IPv6 addresses, hostnames, domain names, e-mail addresses and URLs automatically or with manual tools. Automated tools are started interactively by the user and it automatically uses several tools to do research, then present the results in your web browser. Active Discovery and Diagnostic Tools are used to locate and test devices connected to your network. Passive Discovery Tools are used to find information from third parties or to monitor the activities of devices connected to your network. The included DNS Tools are very versatile and help you find problems with DNS. There are tools designed to provide information about your local computer's network.