Does every computer have a unique ip address?

Answer 1

Yes and no. Every device (computers, some cell phones, your X-Box or other video game) that is connected a network at any given time has a unique address. However, ip addresses can be static or dynamic. A static ip address is assigned to the same computer every time, even if it at some point disconnects and reconnects. With dynamic ip addresses, however, the same computer will be reassigned an ip address each time it disconnects and reconnects to the network.

Answer 2

If your computer is directly connected to the Internet, then yes.

If your computer is behind a firewall or inside a corporate network or a home router, then no, not really. The IP is unique for the local network, but is from a set of numbers that are reused in private networks all over the place.

Every machine connected directly to a network must have a unique IP address, or else data won't get delivered correctly, as the network won't know who it is sending to (or more accurately, the wrong computer may get the data).

A home or workplace router (well, any router really) keeps track of inbound and outbound connections through a single IP on the Internet (this is the router's IP), and remember which computer on its inside network each connection is for.

Answer 3

Well there are two sides to this.

Every computer must have a separate IP address. However, a computer at location A can have the same IP address as computer at location B as long as the following exists:

1. Location A is not connected to Location B by any type of external network

2. If location A is connected to Location B by an external network, than each location must use a hardware device. The hardware devices must have a separate IP Address and must isolate an internal network from the external network.

Item 2 is common for the Internet.

Location A has a firewall which has been assigned the IP Address of 69.100.100.100 to a hardware device. The hardware device also acts as a DHCP Server and uses the range 192.168.1.1 to 192.168.1.255.

Location B has a firewall which has been assigned the IP Address of 27.89.100.23 to a hardware device. The hardware device also acts as a DHCP Server and uses the range 192.168.1.1 to 192.168.1.255.

Because the hardware devices isolate the networks at Locations A and B, the same IP address is possible, just at different locations.

Answer 4

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I think you are confusing IP addresses with MAC (not the computer by Apple) addresses. The IP address is not necessarily unique (think about the fact that most home routers use an intranet address of 192.168.0.0 and computers have 127.0.0.1 as their loopback address). Within a network, the IP addresses need to be unique, but they can be automatically or manually assigned. A MAC address, on the other hand, is a unique code assigned to each network device (to the NIC, routers, etc...). ** Edit ** @ Bill M - Actually some network cards do support changing the MAC address. They aren't as common, but they do exist. @Surbhi - Restarting your modem/router does not guarantee a new IP address. Most ISPs setup their DHCP to assign addresses with a "lease period" of around one week. On a Windows PC, you can type "ipconfig /all" in a DOS prompt and you can see the "Lease Expires". I haven't checked, but your modem should have a similar expiration value. You'd need to leave your modem off for at least that period, just to hope that it picks up a new address (still a chance to get the same address as that will be back in the pool of available addresses).

Answer 5

IP (Internet Protocol) addresses are the way the Internet identifies each unique device connected to the Internet.

Every single computer, server, or other Internet-enabled device is assigned a unique IP address. With such a high number of addresses and users online today, IP addressing has become a very complex task.

Fortunately, many resources are available online about IP addresses to explain how they work. Additional issues related to IP addresses, such as IP privacy and IP address organization, offer insight into the complex realm of IP addresses.





(Internet Protocol address).

Answer 6

Yes. But it might be in a different way than you thikn.

If you have 3 computers at home, behind a router, each computer will have a Local IP. usualy, 10.x.x.x, 172.x.x.x, 192.x.x.x etc. But, they will all have one Public IP address that is assigned by the ISP. A lot of times, school, have 2 or 3 IP addresses that get subneted, a big theory that would take too much to get into and fully explain, but it just splits the ip addresses up more efficiently.

There is a thing called a MAC address. Every piece of equiptment that connect to the internet, has its own. It stands for Media Access Control, and is 12 letters and numbers long.

Answer 7

Every computer that is attached to the internet or another network that uses a set of rules and technologies called TCP/IP has a unique identifier called an ip address. It consists of 4 numbers between 0 - 255 separated by periods.

If the computer is NOT attached to such a network, it does not have an ip address.

IP addresses can be static (don't change) or dynamic (the computer gets a new one every time it connects to the network).

Answer 8

Not necessarily. When a computer is connected to a network, It can either use a static ip, or it can be assigned one by a DHCP Server on the network. If it is assigned one, the ip may change over different connections. Could you perhaps be thinking of the MAC address? This adress is a 12 digit key that is hard encoded on every nic ever made. This address is unique to that interface and will always remain the same if not tampered with. There are however tools that will allow you to change your mac on a software level. This can be useful for circumventing mac adress filtering.

Answer 9

No. Each network device has a unique MAC hardware address that identifies it within its local network, and a IP address that is unique within its local network.

With the widespread use of network address translation (NAT) routers, many computers can use the same IP address as long as it is unique within its local network. A typical home NAT router has an IP address of 192.168.X.1 within your local network, but is assigned a public IP address by your ISP. That public IP address is unique, but within your home network you may have 192.168.X.100, 101, 102 etc. and literally thousands of other computers are using those same addresses on different local LANs throughout the world.

At one time, it was thought we were on the verge of running out of network addresses, and IPv6 was designed to correct the shortage, but with the widespread use of NAT routers, the current system IPv4 is unlikely to be saturated soon.

Answer 10

NO.
Any computer that's accessing the internet through a router probably does NOT have a unique IP address. Routers use one unique IP address externally (visible to the 'net), and then assign a series of non-unique IP addresses to the computers attached to them. For example, my computer's IP address that the router uses to access right now is 192.168.0.2 -- pretty much all routers use that 192.168.0.x format to assign addresses to the computers attached to them locally, there are probably several million with that same IP address active right now :)
The router's one unique IP address is visible outside the local network, but the computer's non-unique address is NOT.