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IP Address Classes and Address Masks

By Mathias N. Hylinski

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IP Addressing

An IP address is a exceptional logical identifier for a node or host connection with the IP network. IP address is often a Thirty two bit binary number, and displayed simply by 4 decimal values of Eight bits each. The decimal values range between Zero to 255. Known as “dotted decimal” notation.

Illustration: 192.189.210.078 Frequently it’s useful to view the values within their binary form.

Dotted decimal illustration: 192 .189 .210 .078

Binary description: 11000000.10111101.11010010.1001110

Each and every IP address is made of network identifier and node identifier. The IP network is split based on Class of network. The class of network depends upon the leading bits of the IP address as shown down below.

Address Classes There are actually 5 various address classes. You can determine which type any IP address is in simply by examining the very first 4 bits of the IP address.

Type A addresses begin with 0xxx, or 1 to 126 decimal.

Class B addresses start with 10xx, or 128 to 191 decimal.

Type C addresses start with 110x, or 192 to 223 decimal.

Category D addresses start with 1110, or 224 to 239 decimal.

Class E addresses start with 1111, or 240 to 254 decimal.

Addresses starting with 01111111, or 127 decimal, are reserved for loopback as well as for internal evaluating on a local machine. Type D addresses are reserved for multicasting. Class E addresses are reserved for future use. They should not be used in host addresses.

Right now we can find out how the Type determines, automatically, which area of the IP address is just about the network (N) and which part belongs to the Host/node (H).

Type A: NNNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH

Type B: NNNNNNNN.NNNNNNNN.HHHHHHHH.HHHHHHHH

Class C: NNNNNNNN.NNNNNNNN.NNNNNNNN.HHHHHHHH

In the illustration, 192.189.210.078 is a Class C address so by default the Network area of the address (often known as the Network Address) is determined from the first 3 octets (192.189.210.XXX) and the node part is determined with the last one octets (XXX.XXX.XXX.078).

For you to specify the network address for a given IP address, the node section is set to all “0″s. In our example, 192.189.210.0 identifies the network address for 192.189.210.078. Once the node section is determined to all “1″s, it identifies a broadcast that’s delivered to most hosts to the network. 192.189.210.255 identifies the broadcast address.

Private Subnets

There are three IP network addresses available to non-public networks. The addresses are usually 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. They can be used by any individual creating internal IP networks, just like an intranet. Internet routers never forward the private addresses within the public Internet.

For more details, I urge you to check this out: what is my ip.

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Article Citation
MLA Style Citation:
Hylinski, Mathias N. "IP Address Classes and Address Masks." IP Address Classes and Address Masks. 7 Feb. 2012. uberarticles.com. 11 Apr 2012 <http://uberarticles.com/computers-and-technology/ip-address-classes-and-address-masks/>.

APA Style Citation:
Hylinski, M (2012, February 7). IP Address Classes and Address Masks. Retrieved April 11, 2012, from http://uberarticles.com/computers-and-technology/ip-address-classes-and-address-masks/

Chicago Style Citation:
Hylinski, Mathias N. "IP Address Classes and Address Masks" uberarticles.com. http://uberarticles.com/computers-and-technology/ip-address-classes-and-address-masks/


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