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IP Addresses : Static vs. Shared
By: Rich Smith
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    One term that is familiar to anyone who has their own website, is the phrase “IP Address”. But what is an IP address, and how does it affect your website? And what is the difference between a static and a shared IP Address?

    To start with, an IP address is a 32-bit numeric address written as four numbers separated by periods. Each of the four numbers can be from 0 to 255, an example would be . The IP address identifies a sender or receiver of information across the Internet. When you request an HTML page or send e-mail the Internet Protocol part of TCP/IP includes your IP address in the message (actually, in each of the packets if more than one is required) and sends it to the IP address of the server to which you wish to communicate. The recipient can see the IP address of the Web page requestor or the e-mail sender and can respond by sending another message using the IP address it received. Each machine on the Internet is assigned a unique IP Address for the purposes of communication.

    Based on this definition, we can establish that an IP Address is analogous to one’s home address. If someone is to send you mail, they put your address on the front of the envelope, and the mailman delivers it right to your door. IP Addresses work precisely the same way.

    There are typically two types of IP Address that can be used in web hosting, Shared or Static. While there is no difference in the IP Address itself, there are some configuration changes on the servers they rest on.

    A static IP Address is when a website has their very own IP Address. This means that whether you type in your URL or the IP address of your website, both will bring you to the same page.

    A shared IP Address is when multiple websites all share the same IP Address. In this case, the web server does a little bit of extra work when it receives your web request, and passes you to the correct website. Typing in the IP Address will not bring you to your desired website, under most conditions. Why do we need this? I’m sure you noticed that, based on the above definition of an IP Address, that there is a finite number of IP Addresses available before we run out completely. If every single website on the internet had it’s own IP Address, there would be no room for any new ones.

    Back to our home address analogy, you might consider a static IP Address to be a stand-alone home. There is only one house who gets mail at that address. You might then consider a shared IP Address to be an apartment building. Many different households get their mail at the same location, and in turn it is distributed to the correct location.

    How does this affect you? In most cases, it wont. A static IP Address may be required if you need to have some sort of special access to your website, like SSL or Anonymous FTP. If you have no special requirements, then a shared IP will work under most conditions.

    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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