Every device which is online gets a public IP to identify it, and any device on a local network gets a private IP to the same end.
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As the name suggests, this tells you what your IP address is. If you have a cutting-edge IPv6 address , which is a longer string of hexadecimal characters, this will be displayed in the relevant field below.
Failing the above online methods, the other way to discover your public IP is to look in your router. To find your private IP on a Windows system, simply open up the command prompt.
Click on it. Three ranges of IP numbers are reserved for local or private IP addresses - these are addresses which identify a device on a local network which is isolated from the internet by a router with Network Address Translation.
These addresses are never used on the public internet. Typically, behind a NAT device, a sub-range from one of these ranges will be used to identify devices on a local network.
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IP Addresses are hierarchical in nature - that is to say, one part of the IP address will specify broadly in which region of the network the destination can be found, with subsequent parts of the address providing more specific information about the location of the target device within that region.
Consequently the allocation of IP addresses needs to be carefully managed, in order to maintain this hierarchy. An IP address as described above is made up of four bytes, in a format known as IPv4. Four bytes can be used to represent over four billion different individual addresses, which might seem sufficient to uniquely label every computer in the world - but with more and more devices being connected to the internet the number of IPv4 addresses which are free to be allocated is dwindling.
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IPv6 mitigates this problem by using sixteen bytes instead of four, which allows approximately 3. In addition, the standard solves various other technical problems that IPv4 suffers from. Unfortunately IPv6 is not interoperable with IPv4, so in order to use it all the internet hardware between IPv6 nodes will need to be updated to be able to use IPv6.
What’s My IP Address?
Instead, the devices in a network use the router to translate requests through the public IP address, which can communicate with other public IP addresses and eventually to other local networks. For example, before landing on this page, your device such as a computer, phone, or tablet , which uses a private IP address, requested this page through a router, which has a public IP address. All the devices laptops, desktops, phones, tablets , and others that are contained within private networks around the world can use a private IP address with virtually no limitation, which can't be said for public IP addresses.
Private IP addresses also provide a way for devices that don't need a connection to the internet, such as file servers and printers, to communicate with the other devices on a network without being directly exposed to the public.
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These are similar to private IP addresses in the sense that they can't be used to communicate on the internet, but they're even more restrictive than that. The most famous reserved IP is No traffic addressed to Technically, the entire range from Addresses in the range from 0. If you're even able to assign a device an IP address in this range, it will not function properly no matter where on the network it's installed. Knowing your private IP address is only helpful in specific, and for most people rare, situations. If you want to connect one computer to another on your network, for example, a mapped network drive , you can do so through its local IP address.
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