To find out ip address domain name of a resource, use one of the specialized network services. For example, this: http://url-sub.ru/tools/web/iphost/ Enter in a field you are interested in the ip, click "Learn". In the box you will see the desired domain name.
If you need to reverse the procedure, i.e. to know the ip address of the domain, this can be done in two ways. First: use network services. For example, the above-mentioned resource: http://url-sub.ru/tools/web/hostip/ Enter domain name, click "Learn". You will see the ip address for this domain.
You can determine the ip address you are interested in the resource by using the ping command. For example, you want to determine the address of the Yandex: http://www.yandex.ru/ Open a command prompt: "start" - "All programs" - "Accessories" - "Command prompt". Enter: ping www.yandex.ru and press Enter. Will start pinging the site, already in the first line you will see the ip address of the resource: 188.8.131.52.
If you need to know where is the physical location you are interested in computer, you can use services like geo IP. For example, this: http://www.ip-ping.ru/ipinfo Try to enter in the search box above ip address with Yandex and evaluate information. You will see not only the location of the server, but also all the related information.
Sometimes you may need to know what IP addresses are connected to your computer. To do this, you can take advantage of the Windows operating system. Again open a command prompt, type netstat –aon. Press Enter. You will see a list of existing connections.
In the column "Local address" you can check addresses and ports on your computer through which you are connecting. The column "Foreign address" shows the address of the remote computer and the port number is used. By using the above-mentioned services, you can determine the location of that computer and the service provider from which you are connecting.