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Scan and document specific hosts that are accessible from the Internet and your internal network. Start by pinging specific host names or IP addresses with one of these tools:

 The basic ping utility that’s built into your operating system (OS).

 A third-party utility that allows you to ping multiple addresses at the same time, such as NetScanTools Pro (www.netscantools.com) for Windows and fping (http://fping.sourceforge.net) for Linux.

 The site WhatIsMyIP.com (www.whatismyip.com) shows how your gateway IP address appears on the Internet. Just browse to that site and the public IP address of your firewall or router appears. This information gives you an idea of the outermost IP address that the world sees.