The range of allowable LAN side IP addresses is called a subnet (as in sub-network, as in, only use these few numbers of all the billions of possible numbers). LAN or Local Area Network side) IP addresses, both for itself and for all the computing devices that connect to it. The public IP address is not a secret and there are many websites that display it (, and In contrast, the router has total control over the private side (a.k.a. The router has no control over the public IP address, it is assigned by the ISP (Comcast, Verizon, Spectrum, etc.). The public side is also referred to as the WAN or Wide Area Network side of the router. The public side of a router is visible on the Internet. Routers differ from other computing devices in that they have (at least) two IP address: a public one and a private one. A common IP address is 192.168.1.1.Įach number can, technically, range from zero to 255. The unique numbers are called IP addresses and theyĪre written as four decimal numbers separated by periods (rather than commas). And, by "computer," I mean any computingĭevice (phones, tablets, ROKU boxes, routers, Amazon Echos etc.). As you would expect, every computer on a network has a unique number.
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