Internet Protocol address

More about your IP address (Internet Protocol address). Connecting to the Internet, either via your internet service provider (T-mobile, Mediacom, Optimum, etc.) you are assigned an IP address. This address identifies your device from the other computers on the Internet. You can get IP address two ways: static or dynamic. Static means address never changes, dynamic means each time you connect online you are assigned a new address for that session. If you use a home router to connect to the Internet, the IP shown from these commands will not be your public IP address but internal IP address. Internal  IP address usually start with a 192.168… (home routers) or 10.10… (servers).

A dynamic IP address is suitable if  you have several computers on an internal network or you need to connect through one-way Virtual Private Network.
A Static IP address is needed if you: run your own website (FTP) or email server or use certain security applications, like centralised cameras and polling software

How to check your current network environment on Windows?

  1. Click on Start/Run,
  2. Enter in the command: cmd
  3. At the command prompt (black background) enter in: ipconfig

If you’d like to know your MAC address (physical hardware address of a your network card), at the command prompt you can enter the following command:
getmac -v

How to check your current network environment on Mac OS?

  1. Click on the Mac logo on the top left of the screen,
  2. Open System Preferences,
  3. Under Internet and Network, click ‘Network’,
  4. Select which adapter, such as AirPort or Ethernet,
  5. Select TCP/IP and you’ll see your IP address.

Since mid 2000s a new version of IP address format has been deployed – IPv6. Old version IPv4 defines an IP address as a 32-bit number (is still in use today). However, because of the growth of the Internet and the predicted depletion of available addresses, a new 128 bits version was developed.