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No two computers can have the same IP address on the entire worldwide internet!

Having made that statement, there is a caveat. There are address ranges which are referred to as "non-routable" addresses. These are often used in small businesses or on home networks. Many, many computers use duplicate non-routable addresses because of a trick in IP.

Referred to as Network Address Translation (NAT), the device (router) used to move information between these non-routable networks and the Internet keep the private (non-routable) address hidden in the small packets or envelopes that make up Internet traffic and assign only the WAN (Wide Area Network) IP address to the packets. To be able to be moved around on the Internet, every single one of these "interfaces" must have unique IP addresses assigned. The embedded non-routable addresses are then read only when packets come back to the private network from a web or some other server.

If IP addresses are like mail that gets sent through the post office, the address for each mailbox has to be unique for the mail to get to any certain building. But a building might have it's own internal mail system that takes all the pieces that came to that address and then sends them to the right person's office or room. That's a pretty good analogy for how the Internet works with addresses.

Many ip addresses are duplicated on private networks, but Internet accessible IP addresses are globally unique, and duplicate IP addresses cannot be used on a single network.

# IP addresses are analogous to telephone numbers - when you want to call someone on the telephone, you must first know their telephone number. Similarly, when a computer on the Internet needs to send data to another computer, it must first know its IP address. IP addresses are typically shown as four numbers separated by decimal points, or "dots". For example, and are IP addresses.

  1. If you need to make a telephone call but you only know the person's name, you can look them up in the telephone directory (or call directory services) to get their telephone number. On the Internet, that directory is called the Domain Name System, or DNS for short. If you know the name of a server, say, and you type this into your web browser, your computer will then go ask its DNS server what the numeric IP address is that is associated with that name.
  2. Every computer on the Internet has an IP address associated with it that uniquely identifies it. However, that address may change over time, especially if the computer is
  3. dialing into an Internet Service Provider (ISP)
  • connected behind a network firewall
  • connected to a broadband service using dynamic IP addressing.
  1. What are static and dynamic addressing?

In static addressing, each PC or device has its own IP address, chosen in the machines configuration, and this address does not change while we do not want to change it. this is good for a Network Manager monitor a network and know by his tables who is the user whose machine is involved in an accident (told by software which only knows IP addresses).

In dynamic addressing, there is a computer that "knows" the addresses that are available in a network in a given moment. Then, a PC coming to the network only needs to ask the DHCP (Dynamic Host Control Protocol) server for an IP address and this is valid only for the current session. This is very convenient for ISPs, Hot spots and any public places where the client users vary a lot.

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โˆ™ 2011-11-22 18:40:23
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Q: Can two computers have the same ip address?
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Related questions

Can two computers in network have the same ip address?

Not in the same LAN segment they cannot.

What happen if i assign a single IP address to two computers which are on if third computer wants to access on computer with that IP address what happens?

No two computers may have the same IP address. This will cause both systems to crash.

What happens if two computers of the same IP address to the same network?

It is not possible, because there will an error that is call ip conflict error.

What should you do when two computers have the same IP address?

Change their IP Addresses so that they read differently. Two Computers cannot have the same IP Address on the same network otherwise there will be IP Conflict causing the systems to drag down the network.... Alternatively, you can use a DHCP and assign IP addresses automatically.In this case, the Host Computer assigns addresses accordingly to all computers on the same network...

Can two computers use the same ip address to send emails?

We can have same ip address on two or more computers in the SAME network; both working simultaneously. They should be in same collission domain. Let their MAC address be same first & then assign them same ip address. You can do so by using a network hub. Watch my associated video on

What happen if two computers have same ip address?

windows will flash up and tell you there is a conflict

How can you have 2 computers with the same ip address?

You can't. Not even with an IP spoof attack.

What is the purpose of the ipv4 address?

The IP address is what is used to locate a computer over the Internet. The domain name - for example, - is only a shortcut, easy to read for humans. Before the corresponding server or servers can be accessed, the IP address must first be found. In the case of publicly accessible computers, the IP address is unique worldwide - that is, no two computers have the same IP address.

Importance of IP address?

Ip address play a key role in the networked computers to identify the computers

What is ip in the networking of computers?

An IP address is something like a telephone number. It allows another computer with an IP address to send or receive data between the two computers. Also like a phone number, the IP address can't be duplicated on the same network, each computer needs it's own, and there needs to be a known route between the two.

If you use an adsl modem and connected to two computer is your ip same on both computers?

No, each computer must have a different IP address. The IP addresses have to be in the same subnet between themselves, and in the same subnet as the ADSL router (or modem); I won't explain subnets here, but usually having the same numbers for the first 3 parts of the IP address is enough. For example, if the ADSL router has the IP address, your computers might have addresses and If you need to add a third computer, give it the IP address the first computer has a different IP address - and it works - replace that, instead. For example, if the computer has IP address, assign the address to the next computer.

If 2 computers have the same ip address will it slow down the internet connection?


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