192.168.1.5 is a Class C private IPV4 address that can be assigned to any device connected to a home wireless network if it’s one of the available addresses in the DHCP pool. If your modem’s/router’s default gateway is 192.168.1.1 (various manufacturers use it as a default gateway for their devices – Cisco, Dell, Actiontec, Airlink, Asus, Aztech, D-Link, Eminent, Huawei, Linksys, Siemens, etc.), or if your router’s gateway is 192.168.1.254, 192.168.1.5 will be one of the available IP addresses and it can be assigned to your PC, phone, tablet, etc. This address can be assigned automatically (if you don’t want to change default settings) or manually.
Assigning 192.168.1.5 Automatically (Dynamic IP)
If you don’t want to reserve this address for your PC manually, it can be assigned to your PC by your router automatically if it’s one of the available addresses in DHCP pool (but some other IP address can also be assigned to your device and there is no way to force the router to automatically assign this exact address unless you assign it manually). In order to get this address assigned to your device, you will have to be on the 192.168.1.0 network (in other words, if your router’s default gateway 192.168.1.1, this address will be one of the available and it could be assigned to your device).
Assigning 192.168.1.5 Manually (Static IP)
If you want your device to have the same IP every time it gets connected to your home network (static IP), you can assign 192.168.1.5 manually to your device. In order to do that, you can go to your router’s setup page, open the DHCP tab, and make a reservation, or you can open Network and Sharing Center, go to Change Adapter Settings tab, open Wireless Network Connection Properties, and then go to TCP/IPV4 properties and enter this address manually along with subnet mask, default gateway, and DNS server address.
When assigning IP address manually, you have to be really careful and try not to assign 192.168.1.5 if it’s already assigned (automatically) to some other device. If you do that, you will cause an IP conflict and none of those two devices with the same IP address will be able to connect to your home network. In order to resolve this issue, you have to disconnect both devices and wait for the DHCP lease time to expire (when a router assigns an IP address automatically, it actually leases it for a certain period of time and after that time expires, the address gets back to the DHCP pool if that device is not connected anymore or the lease gets renewed if the device is still connected). When the lease time expires, you can assign this address manually to your PC or any other device and connect it to your home network. After that, you can connect that other device to your home network. Some other address will be assigned to that device since 192.168.1.5 is reserved and there will be no IP conflict.