Answer
A network device, i.e. network/LAN adapter, modem, router, access point, can have a single IP address (either LAN  or WAN IP address) or two IP addresses (both LAN and WAN IP addresses). To clarify this point, I would like to depict three Internet access scenarios as follows:1) A computer connects to Internet via an internal/external modem that has no router functionality.

a computer connected to Internet via a broadband modem.

- This computer IP address is similar with the modem IP address, i.e. a WAN IP address (public IP address) which is assigned by the ISP, such as 194.223.19.212.

2) A computer connects to Internet via an external modem that has router functionality.

a computer connected to Internet via a broadband modem with router functionality.

- This computer (i.e. the network adapter that connects it to the modem) will have a LAN IP address (private IP address) such as 192.168.1.2.

- Meanwhile the modem will have a LAN IP address (private gateway IP address) such as 192.168.1.1 toward the connected computers and a WAN IP address (public IP address) toward the ISP.

3) A computer connects to Internet via a wired/wireless router which in turn connects to Internet via a broadband (DSL/cable/3G/3.5G/4G) modem.

a computer connected to Internet via a wired/wireless router and a broadband modem.

- This computer (i.e. the network adapter (Ethernet/Wi-Fi/Bluetooth) that connects it to the modem) will get a LAN IP address (private IP address) such as 192.168.2.3.

- The router will have a LAN IP address (private gateway IP address) such as 192.168.2.1 and a WAN IP address (also a private IP address) such as 192.168.1.2.

- The broadband modem which borders the LAN (home/company/organization network) with the WAN (Internet) will have a LAN IP address (private gateway IP address) such as 192.168.1.1 and a WAN IP address (public IP address) toward the ISP.

The breakdown on configuration number 2 or 3 above also applies if this computer is an ICS (Internet Connection Sharing) client that connects to Internet via an ICS host because the ICS host acts as a router.

You can check your computer IP address and find out which network card or adapter that connects you to the Internet by typing ipconfig /all on the Command Prompt. To check your modem or router LAN and WAN IP addresses, you can type its pre-defined address on a browser (IE, Mozilla Firefox, Chrome, etc.) address bar, e.g. http://192.168.1.1 and see the connection details usually on a Home/Status page.