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The mac address isn't routable over TCP/IP (the internet) so devices with the same mac address can exist on the internet at large. The device with that IP address replies to the ARP (with its MAC address). When the Command Prompt shortcut appears, right-click on it and select Run as administrator.
Ip address to mac address converter windows#
Windows systems Go to START -> Type CMD or Command to get to the Command Prompt application. To simplify: In most cases, to resolve the MAC address associated with an IP address, you send a broadcast ARP packet (to all devices in the network), asking who has that IP address. We will now look at how you can find the IP and MAC addresses of your machine or another one that is connected to the network. It takes MAC Address as input string and generates a query against given MAC address and conversion option like convert into IPv6 to IPv4 or both then performs the above steps.
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That doesn't mean to say they can't be changed or spoofed and often are. IP to mac mappings are stored in each devices ARP table (the phone book in your analogy). You can also use perfect MAC address converter can convert any MAC address into IPv4 internet protocol address ranges and IPV6 internet protocol address ranges. The first 3 bytes designate the manufacturer and the last three are a number given to it at manufacture by the maker. On a more involved level (which you don't really need to know for setting up routers and stuff) mac addresses are usually unique to a device and you can't have more than 1 of that number on a local (non routed) network. IP addresses on the other hand are now 4 bytes (until IPv6 happens) and almost always expressed in Decimal format as a number 0 - 255. Sometimes the letters are upper case, sometimes lower case, but never mixed. They are invariably expressed in hexdecimal notation (base 16, uses the characters 0-9 + A-F - each byte uses 2 characters since 16 * 16 is 256). A mac address is always 6 bytes long, how they are seperated varies, but is usually colons.