Please explain how a wireless computer with router can have three IP addresses? Which is real one?
One is router and one is provider assigned I don't know about the other one. We are talking about Broadband.
I believe that any wireless device that may be attached to the computer has its own unique IP address. For example my computer has one, and my printer has one that is slightly different. If the router is wireless, it may have its own IP address. If you have more than one computer using the router there will be even more.
Hopefully I understand you're question. If not, I apologize in advance. Your computer should have 1 IP address per network interface card (NIC), although they can have multiple. This means that your wireless card will have an IP address and any wired ethernet cards will have their own addresses. Your router will (typically) have two IP addresses: one is public and one is private. The public address will allow you to communicate with your ISP and therefore the internet. The private address is to communicate with a subnetwork (subnet) that will have all your personal devices: laptops, pc's, printers, etc. All your computers and other network devices will use the public address of your router to communicate outside the subnet, a.k.a. with the internet. In other words, all the traffic from the internet will go to the router (via the public address) and then the router will forward the traffic to the appropriate subnet device (via its private address and subnet addresses of the devices).
Hope this helps! Please send me a message or respond to this answer if you have further questions.
The figure below shows different classes of IP addresses. These addresses differ in the number of bits assigned to the network and host ids. Different classes of addresses serve different needs. For example, a class A IP address is suitable when the internet consists of a small number of networks but each network consists of a large number of hosts. On the other extreme, class C addressing is suitable for Internets with a very large number of networks, with a small number of hosts per network.
IP Address Classification (Class A, Class B, Class C).
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