Well, you could have more than 2 network devices on your laptop, get on your laptop and open a command prompt (run > cmd) type 'getmac' (with out the quotes) that will list all the mac addresses for your system. If the mac address (or mac addresses) don’t match the ones under dhcp, you may have some one else on your network, if you are a noob, I guess the network is just an open network with out any type of encryption or limitation on who can connect to it. It could very well be that you had your laptop connected through a Ethernet cable and through wireless, that would do it right there. both devices have different macs.
2nd, you can easily spoof a mac address in some operating systems.
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