hackeh1

now  friends i want to tell you starrting concept of ethical hacking


scope of ethical hacking
   right now there are 32000 ethical hackers only. ethical hacker in the world need of them is in lakhs

now i want to tell you about ip address
ip addresses are two types

1. private
2. public

Now i want to tell you about private ip address

When you send a letter from your house to a friend, you have to know the address to send it to so that the postman knows which street and which house to take it to. Computer networks such as the Internet are no different, except instead of sending your Web traffic to an address like 1145 Main Street, your computer's "location" (the destination for your emails and Google inquiries) is known by its IP (Internet protocol) address.

In theory, your individual computer has to have its own unique IP address so that it will only receive the information that is meant for you. You don't want your emails and the responses to your Google searches going anywhere else. (If you go to the WhatIsMyIPAddress.com home page, you can see your public IP address.)

However, there is a major exception to this: That would be those network computers that are linked to a router and share the same IP address. Included in that number are home/office networks. All routers have an IP address built in.

In this instance, the router—once it has established its Internet connection through an Internet Service Provider—sends data to each individual device on that network based on something called a Network Address Translator (NAT).

The organization that doles out IP addresses to the world reserves a range of IP addresses for private networks. Private networks can use IP addresses anywhere in the following ranges:

• 192.168.0.0 - 192.168.255.255 (65,536 IP addresses)
• 172.16.0.0 - 172.31.255.255 (1,048,576 IP addresses)
• 10.0.0.0 - 10.255.255.255 (16,777,216 IP addresses)

Public Addresses

Public addresses are assigned by InterNIC and consist of class-based network IDs or blocks of CIDR-based addresses (called CIDR blocks) that are guaranteed to be globally unique to the Internet.

When the public addresses are assigned, routes are programmed into the routers of the Internet so that traffic to the assigned public addresses can reach their locations. Traffic to destination public addresses are reachable on the Internet.

For example, when an organization is assigned a CIDR block in the form of a network ID and subnet mask, that [network ID, subnet mask] pair also exists as a route in the routers of the Internet. IP packets destined to an address within the CIDR block are routed to the proper destination.

next topic i will discuss about how to hide ip address