The MAC addresses on the LAN and WAN side of most home routers are exactly one increment apart. All we have to do is add one (1) to the value of the LAN MAC printed on the bottom of the router. Sometimes, though, we have trouble doing that addition in our head because the LAN MAC might end in F, the highest hex digit, meaning more than one digit in the number will change, kind of like 899 will roll over to 900 when adding one. So, there's an easy way to do this:
Start your calculator (using Windows XP in this example).
Switch to Scientific mode:
Change the base to "Hex."
Enter the hexadecimal value
Since the number 1 is the same in hex as it is in decimal, we don't have to do any conversions to increment this value by one. Just add one (1) by clicking the "+" and the "1" and the "=." Your new value will be displayed.
Cross-posted at techpickle.org.
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