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What is an IP Address?

"An identifier for a computer or device on a TCP/IP network" as defined by Webopedia.

In simple terms, its a number that consists of four numbers, separated by periods, that can be between 0 and 255. This number identifies the device (e.g. comptuer) that is connected to the Internet, which is a TCP/IP network. It is like the address of your house, but instead of a house number, street, city, state, zipcode, it looks something like this:

Each device on the Internet gets assigned a unique IP Address. No two devices can have the same IP Address just like no two houses on your street have the exact same address.


For what is an IP Address used?

When your computer is on the Internet, anything you do requires data to be transmitted and received. For example, when you visit a web site, such as, data is transmitted to your computer in order to load the content of the web page. The server where is located needs to know where to send the data. When you connect to, it receives your IP Address and then knows where to send the data. For example, someone that needs to mail you a letter has to know your address in order to send it to you just like a server needs to know your IP Address to send you data.

To LEARN MORE on IP addresses, some recommended reading is Understanding IP Addressing at Webopedia.


Decoding your IP Address

Your IP Address tells can provide a lot of information such as your approximate location (city, state, country), your Internet Service Provider (e.g. AOL, Earthlink, Mindspring), and even your approximate longitude and latitude. lets you LEARN MORE about your IP and location information (city, state, country, ISP).


Who assigns IP Addresses?

Just like your home address is decided by your local city or postal service, there are four non-profit agencies, called Internet registries, that are in charge of assigning IP Addresses: ARIN, RIPE NCC, LACNIC and APNIC. Each Internet registry is responsible for a different region of the world.


What are hosts and how are they related to IP Addresses?

Remembering IP Addresses for sites can be difficult. For example, if you want to go to your friend's house, you know where it is, but you don't tell people you're going to an address, you tell them you're going to your friend's house. The Internet works in much of the same way. Each IP Address has the option of being resolved (converted) into a host. For example, resolves to Either visiting the IP Address or the Host will take you to's web page. It is much easier to remember than to remember the IP Address it resolves to.


How many IP Address combinations can there be? What will be done when they run out?

There can be 4.3 billion combinations of IP Addresses. The current system of IP Addresses is called IPv4. The IPv4 exhaustion of IP Addresses is being resolved with a new system called IPv6.

Where can I find more information?

One of the best resources to search for information about is Google.


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