How to Trace an IP Address
What they're doing is tracing the Internet Protocol (IP) address of the bad guy. Whenever you go online, your computer is assigned a unique IP address, as is every computer connected to the Internet. An IP address is needed to send and receive information, much like a street address is needed to receive regular mail. Tracing an IP address is not very hard to do, and we'll show you how.
Website IP Address
1. Open a command console. On a Mac, it's called Terminal and it's in the Utilities folder. On a PC, click on Start, then Accessories, and then Command Prompt. This will let us ping any website to find out the IP address of that website.
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2. Ping an address. This sends a signal out to a URL—like a sonar, hence the name—which then bounces back with the website information attached, and how long the round trip took.
Type "ping [URL]" - example: ping www.facebook.com.
3. Press return. The IP address should appear beside the website name, followed by how many seconds or milliseconds the ping took.
The format of an IP address is numeric, written as four numbers separated by periods. For Facebook, the IP address is 126.96.36.199.
Email IP Address
1. Open your email client. To find the IP of an email sent to you, you can investigate the message's headers—that stuff that looks like a keyboard exploded on the message.
2. Show headers. From the View menu, select the option that lets you view all or extended headers, and your To/From section will blossom with new information. From all that information, you only need a couple bits to search for.
Next to the Received section you will see something like "from..... and an IP address as described above. Select one of those, and copy it to the clipboard. In this case, we'll select 188.8.131.52, and copy it. We can see that it says Received from mx-out.facebook.com, so we'll do a test to see if that's accurate.
3. Open a command console. This is described above. Only this time, instead of doing a ping on a known address, we're going to run a whois check.
In your terminal window, by the flashing cursor, type whois 184.108.40.206, and press Enter. The information will be sent out to a database, queried, and then returned with the registration information for that IP address.
In this case, we can verify that the message was sent through Facebook. Notice we also have their full address.
4. Use an alternative lookup. You may not want to use the terminal, or perhaps it's not loaded on your computer. Instead, you can try using an internet lookup, such as ip-lookup, which gives you much the same information as a whois lookup, and in many cases, much more.