Author Topic: What is an IP Address?  (Read 179 times)

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Offline h2obubbler

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What is an IP Address?
« on: July 30, 2008, 09:19:59 AM »
http://www.selfseo.com/what_is_my_ip.php
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Every machine on the Internet has a unique identifying number, called an IP Address. A typical IP address looks like this: 195.24.53.107

The four numbers in an IP address are used in different ways to identify a particular network and a host on that network. Those numbers are called octets, because they each have eight positions when viewed in binary form. The octets serve a purpose other than simply separating the numbers. They are used to create classes of IP addresses.

    * Class A - This class is for very large networks, such as a major international company might have. IP addresses with a first octet from 1 to 126 are part of this class.

    * Class B - Class B is used for medium-sized networks. A good example is a large college campus. IP addresses with a first octet from 128 to 191 are part of this class.

    * Class C - Class C addresses are commonly used for small to mid-size businesses. IP addresses with a first octet from 192 to 223 are part of this class.

    * Class D - Used for multicasts (where a node sends a packet addressed to a special group address.). For multicasts, the first octet has a value of 224.

    * Class E with the first octet of 225 is used for experimental purposes only.

Loopback - The IP address 127.0.0.1 is used as the loopback address. This means that it is used by the host computer to send a message back to itself. It is commonly used for troubleshooting and network testing.

Broadcast - Messages that are intended for all computers on a network are sent as broadcasts. These messages always use the IP address 255.255.255.255.

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What is an IP Address?
« on: July 30, 2008, 09:19:59 AM »

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