How to change IP address is a FAQ for some people with lack of computers networking experience and knowledge, but they have small networking environment at home. Small and simple networking at home can include wireless router and modem to share the broadband internet connection with some computers in the household.
There are occasions when you need to change IP address for the computers that connect to the network. In a situation where your network does not provide a DHCP services, or you need to configure an IP address of the computer with static IP address. Or you need to provide a static public IP address to the WAN interface of the router for your network which is provided by the ISP.
Before you need to change IP address, it’s essential to know which IP address ranges you can use for the computers on your private network and which IP address ranges you can use for the WAN interface of the router. You can check out this link for a more detail discussion about designing the IP address for the business and corporate with multi sites. One thing you need to notice is that the use of the private IP address (table bellow) for the private network behind the router.
| Class Type | Start Address | End Address |
| Class A | 10.0.0.0 | 10.255.255.254 |
| Class B | 172.16.0.0 | 172.31.255.254 |
| Class C | 192.168.0.0 | 192.168.255.254 |
Have a look at the network diagram below; the WAN interface that is facing the internet must be the public IP address. It depends on how your ISP supplies the IP address to the subscriber, it can be set dynamically or using the static public IP address. You can consult with your ISP about this WAN interface of your router, they usually guide you how to change IP address on this WAN interface.
The simple network diagram
What about the private network behind the router, how to change IP address for the computers on this network? First thing you need to do is to provide the IP address of the router – as the gateway to which all the computers default gateway will be set to this IP address. However, mostly all the wireless routers come with the default IP address such as 192.168.1.1. Now, if your router supports the DHCP services, you just leave the factory default where the DHCP service is enabled.
With the DHCP service of the router is enabled, you don’t need to change IP address for the computers on the network. As long as the property of the TCP/IP protocol on the NIC computers is configured to obtain the IP address automatically, everything will be fine.
If the wireless router does not support the DHCP server or you disable the service, you need to change IP address of the computers on the network manually with static IP address. All the computers on the network must have the same subnet with the Gateway address set on the router. for example if the router Gateway IP address is 192.168.1.1 with subnet mask 255.255.255.0 you also need to configure the unique IP address of the computers on this subnet too such as 192.168.1.2 and son on.
How to change IP address of the computer manually? For example if your router IP address is 192.168.1.1 subnet mask 255.255.255.0 and you need to change IP address of the computer on the range of 192.168.1.2 until 192.168.1.254 with subnet mask 255.255.255.0 and default gateway to the router IP address (192.168.1.1).
Click the computer icon on the bottom right of the monitor and click the Property.
| Click the computer icon on the bottom right of the monitor and click the Property. This is the active NIC adapter of the computer. |
 Locate the computer icon at the right bottom |
| Select the Internet protocol (TCP/IP) and then click the property. |
 Select the TCP/IP Property |
Check the Use the following IP address, and type in the computer IP address for example
You need to know the preferred and alternate DNS server from the ISP for example:
And then click OK to finish the configuration. |
 Type in the IP address manually |
Related article you need to read: Network security software for business or corporate to protect against total internet threats.
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