Every computer connected to the Internet has an IP address, which is like the computer equivalent of a telephone number. In many cases, your computer gets a different IP address each time you start it up. But if you have a fixed IP address, it's always the same, no matter how often you turn the computer off or on,
A fixed IP address is sometimes known as a static IP address. It is an address that is assigned to a computer by an Internet service provider (ISP) to be its permanent address on the Internet.
Computers use IP addresses to locate and talk to each other on the Internet, much the same way people use phone numbers to locate and talk to one another on the telephone. The machine will retain that IP address no matter how many times it connects/disconnects from a network.
When you sign on to your internet provider, you get assigned an IP address on their server. This usually changes from session to session, and even inside a session — you are getting a lease to that address, rather like renting a property. So, you might seldom get the same address, unless you don't sign off that address.
For most users of the internet, that's good enough, since very few of us really need to know that IP address as we browse around the Web.
A fixed IP address is one that assigned solely to you. That's essential if you want to get there by IP address for some reason (like if you have a server that will be accessed by many people, or you need true anonymity, with only those who know the IP address ever going there. Some webmasters make very good use of this, rather than URLs.
DNS maps domain names to IP addresses. Your browser then connects to that IP address. Difference between static and dynamic IPs. When a device is assigned a static IP address, the address does not change. Most devices use dynamic IP addresses, which are assigned by the network when they connect and change over time.
One that does not change when the computer starts.
Ask you ISP