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What is an IP Address
An IP address is a unique address which is assigned to you by your ISP (Internet Service Provider) which identifies your computer on the internet, which, in turn, allows your computer to communicate with other computers on the internet around the world.

IP addresses can be static or dynamic. With a static address your IP is permanently set and will remain the same and will never alter. Static addresses are mostly found in the corporate sector. A dynamic address is what most public users have assigned to them. This involves your ISP issuing you with a lease alongside your IP address which last usually 24 or 48 hours, after which, it is then released and renewed. If your computer modem is not connected to the internet when the lease runs out and it is released, your IP can then be assigned to another machine. Then in this case your IP will change.

Internal & external addresses
IP addresses can be internal or external addresses. If you are connected directly to the internet via a modem only , then you will use just an external address. However, if you are running from a home network through a router then you will have 2 address ranges, an internal address range for the network itself (within your router as to speak) and and external address which is the IP assigned by your ISP - the part from your router to the external world.

Internal IP address are assigned using a certain address range. if you are to configure a newtork and you choose to manually assign the IP address then you must use certain address ranges that have been specially set out. The internal address ranges are as follows

  • Range a) 10.0.0.0 - 10.255.255.255
  • Range b) 172.16.0.0 - 172.31.255.255
  • Range c) 192.168.0.0 - 192.168.255.255

Finding your ip address
For Windows XP users:
To Find your IP address simply go to the start menu, select the option which says "run" then type in the following into the open box - cmd This in turn will open up a command prompt. From the command prompt type in the follow as shown - ipconfig - this will now reveal your IP address. If the IP address returned is within any of the ranges a - c above then you will have a seperate external address which will be viewable at the top of this page

For Windows Vista users:
The process is the same as above except you type the cmd command into the start search box in the windows start menu.