commonly used ip address 192.168.x.x

See the following site
http://www.networkcomputing.com/netdesign/ip101.html

192.168.0.0/16 is private IP address space that is non-routable on the Internet. Refer to RFC 1918 for addional information related to private address space. In short, private address ranges include 10/8, 172.16/12, and 192.168/16. IANA has also reserved some smaller IP address ranges for non-public address use.

If I understand what you're asking, don't look at each octet seperately. The IP address denotes the class your network is in (A, B, C, D...) In your example the class would be a class C network, (192.168.x) being the subnet and the final "x" denoting a specific node (workstation). There are a lot of exceptions to what I just said! But for the purposes of simply answering your question I think does. And I hope I don't get slammed by a TCP expert.

Jason Silva

Here is a site with a very good example of what an IP address is and what it means. http://www.howstuffworks.com/question549.htm

There are two aspects to your question:
- general understanding of IP addresses
- specific usage of 192.168.x.x
I will address the latter, assuming you know about the structure of an IP address and about subnets.
The world has many computers andother devices that are addressable via IP, but the current addressing scheme has only a certain number of addresses available (more than 4 billion, but because of the way addresses are administered, many of the theoretical number of addresses are not used). In fact, only certain computers really need to have IP addresses that are known on the Internet and addressable by anyone else on the Internet. These tend to be routers or various servers providing services to Internet users, like DNS servers, FTP servers, etc. Each IP address visible from the Internet must be unique. Failure to obey this rule is one the worst errors you can make on the Internet. Fortunately, most computers can use "private" IP addresses that are never visible directly on the Internet. Most organizations use these private addresses and do not worry about getting unique IP addresses for all their computers etc. 192.168.x.x is the suggested address range for an organization that needs up to about 65000 different IP addresses. If the organization needs more (up to about 16.5 million addresses) then they can use 10.x.x.x.
When any of these computers connects to a device over the Internet, there is an address translation performed somewhere (such as by a router), so that to the Internet, that computer has a valid and unique IP address).

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