A Brief Overview of IP Addresses

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Port Forward Staff
July 23, 2021 (Last Updated: ) | Reading Time: 2 minutes

An IP address (Internet Protocol address) is an assigned numerical label that is used to identify Internet communicating devices on a computer network. Think of it like this: An IP address is to a computer what a telephone number is to a house. Each computer or house can stand alone without its respective IP address or telephone number. However, if you want to be able to communicate with people in other houses from within your house, you will need a telephone number. In a like manner, if you would like to communicate with other computers from yours, you will need an IP address.

Technical Facts about an IP Address

In more technical terms:

Internal vs External IP Addresses

If you are using a home router then you likely have both an External and Internal IP address.

Your External IP address will be issued to you by your ISP (Internet Service Provider). Because an IP address acts as identification number, no two computers on the Internet can have the same External IP address. Your External IP address will be the IP address that is used to contact your computer by the outside world.

Everything connected on your side of your router is in your local network and is designated a unique Internal IP address. In most cases, Internal IP addresses are issued by your router, but you may set a static IP address for the nodes in your local network. For more information on how to set up a static IP address click here.

There are some IP address ranges that are commonly used for internal networks. Here are a few examples of what these addresses look like:

Where x can represent any number from 0 to 255.

Static vs Dynamic IP Addresses

Dynamic IP addresses are IP addresses that are vended by a router to a node when necessary. As their name would suggest Dynamic IP addresses are not fixed and are subject to change. Dynamic IP addresses are a handy network function but they can cause problems when trying to do more advanced networking proceedures like port forwarding. If the IP address to which you port forward changes, then your port forwards no longer work.

Static IP addresses are unchanging IP addresses that are assigned to a network node. Static IP addresses will never change. When using Static IP addresses you lose a small amount of plug and play functionality, but you gain reliability. We have a complete set of guides to show you how to set up a Static IP address located here. We even offer free software that will set up a Static IP address for you.

Please note that for almost all purposes regarding port forwarding you will only need to set up a static Internal IP address.

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