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Wednesday, February 2, 2011

WHAT IS IP(INTERNET PROTOCOL)

IP Short for Internet Protocol, IP is an address of a computer or other network device on a network using IP or TCP/IP. For example, the number "166.70.10.23" is an example of such an address. These addresses are similar to an addresses used on a house and is what allows data to reach the appropriate destination on a network.

There are five classes of available IP ranges: Class A, Class B, Class C, Class D and Class E, while only A, B and C are commonly used. Each class allows for a range of valid IP addresses. Below is a listing of these addresses.

ClassAddress RangeSupports
Class A1.0.0.1 to 126.255.255.254Supports 16 million hosts on each of 127 networks.
Class B128.1.0.1 to 191.255.255.254Supports 65,000 hosts on each of 16,000 networks.
Class C192.0.1.1 to 223.255.254.254Supports 254 hosts on each of 2 million networks.
Class D224.0.0.0 to 239.255.255.255Reserved for multicast groups.
Class E240.0.0.0 to 254.255.255.254Reserved for future use, or Research and Development Purposes.

Ranges 127.x.x.x are reserved for loopback or localhost, for example, 127.0.0.1 is the common loopback address. Range 255.255.255.255 broadcasts to all hosts on the local network.

IP address breakdown

Every IP address is broke down into four sets of octets that break down into binary to represent the actual IP address. The below chart is an example of the IP 255.255.255.255. If you are new to binary, we highly recommend reading our binary and hexadecimal conversions section to get a better understanding of what we're doing in the below charts.

IP: 255255255255
Binary value: 11111111111111111111111111111111
Octet value:8888

If we were to break down the IP "166.70.10.23", you would get the below value. The below fist row is the IP address, the second row the binary values, and the third row the binary value calculated to equal the total of that section of the IP address.

166701023
10100110 010001100000101000010111
128+32+4+2=16664+4+2=708+2=1016+4+2+1=23

Automatically assigned addresses

There are several IP addresses that are automatically assigned when you setup a home network. These default addresses are what allow your computer and other network devices to communicate and broadcast information over your network. Below is the most commonly assigned network addresses in a home network.

192.168.1.00 is the automatically assigned network address.
192.168.1.11 is the commonly used address used as the gateway.
192.168.1.22 is also a commonly used address used for a gateway.
192.168.1.3 - 254Addresses beyond 3 are assigned to computers and devices on the network.
192.168.1.255255 is automatically assigned on most networks as the broadcast address.

Getting an IP address

By default the router you use will assign each of your computers their own IP address, often using NAT to forward the data coming from those computers to outside networks such as the Internet. If you need to register an IP address that can be seen on the Internet, you must register through InterNIC or use a web host that can assign you addresses.

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