IP Addresses

> My desktop computer IP address is: xxx.xxx.1.5

   Ok.

> and the IP address on the Nighthawk app is: xxx.xxx.1.1

   Which is the IP address of what?

   "192.168.1.1" and "192.168.1.5"?  Different devices on a LAN _must_
have different IP addresses.

> [...] Will it cause problems?

   You'd have problems if they were the same.

   Strictly speaking, a computer (or similar device) does not have an IP
address; a network _interface_ has an IP address.  If a computer/device
has only one network interface, then you can get sloppy, and associate
the address with the computer/device itself.

   If a computer/device has more than one active network interface, then
each interface must have its own unique IP address, and referring to
"the address of the computer/device" would be misleading.

   Your router, for example, has an IP address for its WAN/Internet
interface (your external/public address), and a different IP address for
its LAN interface ("192.168.1.1", apparently).

> Model: R6700|Nighthawk AC1750 Smart WiFi Router

   R6700[v1], R6700v2, or R6700v3?  Look for "Model" on the product
label.  Firmware version?

   On its management web site ("routerlogin.net", or "192.168.1.1"?),
look at ADVANCED > ADVANCED Home, and search for "IP Address".