Configuring a Windows Server IP address hasn’t really changed much in the last 15 years, albeit Microsoft did try to make it super complicated to get to during the Windows Vista and Windows 7 period. However the designers behind Windows Server 2012 R2 have made it a lot easier to update IP address settings.
The Easy option is to right click on the Start Button and then select Network Connections from the context menu. (Note: this option also works for Windows 8.1 Update 1 too)
alternatively, from Server Manager, click the IP Address that is listed against the Ethernet settings.
The Network Connections screen will then be displayed. Right click on the network card that you want to change the IP address for, then choose Properties from the context menu.
Scroll to the bottom of the list and double click on the Internet Protocol Version 4 (TCP/IP)
The current settings for the IPv4 stack will then be displayed.
Update the settings as required, entering an IP address in your network, the relevant subnet mask and also the DNS server addresses. If you have an Active Directory Domain Controller, the DNS IP address should be set to use the internal DNS, otherwise use the defaults provided by your service provider.
When you are done, click the Ok buttons until the dialog boxes close. Its always a good idea to check that you can ping your default gateway/router and also perform a DNS lookup request to verify that the connection is valid (you can also use that “Validate settings upon exit” tick box which will perform a similar type of test).