What distinguishes a static IP address from dynamic? The fact that the first never changes, while the second changes with each new connection. The type of IP address is determined by the provider and largely depends on your connection method. Wired Internet it is usually (but not always) static – that is, assigned once and does not change even if you shut down the computer.
In that case, if you use a USB modem, the IP address is dynamic. When you connect you are assigned a free address from owned provider of a range, with the logs of the server through which you connect provides information about who and at what time was assigned to this IP address. If you are using a USB modem there is the possibility, for a fee, to obtain a permanent address.
To determine your IP addresses go to one of the services providing similar services, for example, on the website http://www.ip-1.ru/ At the top of the page you will see your current network address. Write it down, then disconnect from the Internet and wait a few minutes. Then connect again to the Internet, log on to the above services and check the same recording. If it is the same, it means that your IP address static. If the record has changed, something dynamic.
Are there advantages of static or dynamic addresses? Static address need someone who is on your computer open resources – for example, set your ftp server. If you are a site administrator, then the static address allows you to configure entry to the resource to bind to an IP address, which greatly increases safety.
The disadvantage of static IP addresses that an attacker, knowing it can methodically pick "pick" to your computer. Since the IP address never changes, he has nearly unlimited time to crack. In this respect much more safe is the dynamic address changing with each new connection.