Let’s take a complete, detailed look at the entire issue of IP addresses, and look at the ways in which they can be unique to devices and routers, but also follow and similar patterns and work across a similar range, and can actually be identical in the case of private IP’s at least. In other words, IP addresses are both unique and not unique at the same time! There’s quite a lot of nuance to the issue, and the distinction between public and private IP addresses is crucial to understand why, but it actually is possible and common for devices connected to different routers to have the same private IP address (though the public IP address will always be different). However, because private IP addresses follow a common set of ranges, such as 192.168.1.1-254, the same private IP addresses can often be seen across devices on different networks. Private IP addresses are assigned to devices by the router and are unique to each device within that particular network. Public IP addresses are unique to a router/household, meaning devices connecting to the same router should have the same public IP address. To answer the question fully and completely requires that we firstly differentiate between public and private IP addresses, but here is a quick summary answer: But are IP addresses actually unique to a computer or router? Do they change over time and can multiple devices have the same IP address? There’s lot of talk of IP addresses nowadays, and it’s even relatively easy to find the IP address of your device using online tools or through network settings.

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