Please see image.
Does anyone have any idea of whats going on?
They come and go as attached devices in my attached devices list.
I also attached my routers log for you all to see. http://pastie.org/8997306
188.8.131.52 = 'x[i+' 184.108.40.206 = ' a, ' 220.127.116.11 = '"cen' 63:20:3d:20:69:69 = 'c = ii' 20:62:3c:74:64:20 = ' b<td ' 42:43:3a:33:42:3a = 'BC:3B:'
Not coincidentally, the "BC:3B:" in the last address is the same as the beginning of your first MAC address listed, which @Anti-weakpasswords notes belongs to an Apple device.
I would recommend rebooting your device, and checking for any available firmware updates from NETGEAR.
Looking at the OUI, it appears you have 3 Apple MACs connected, 1 Netgear MAC, and 3 unknown MACs.
The Apple and Netgear MACs may be spoofed; please compare them against your own devices. Then, if you can, compare their traffic against the legitimate device's traffic to see if those MAC's are being spoofed.
The unknown MACs are almost certainly spoofed. Note that I don't see 120.91 in the log snippet at all, which is interesting.
BC-3B-AF (hex) Apple BC3BAF (base 16) Apple 1 Infinite Loop Cupertino CA 95014 UNITED STATES 30-F7-C5 (hex) Apple 30F7C5 (base 16) Apple 1 Infinite Loop Cupertino CA 95014 UNITED STATES C4-3D-C7 (hex) NETGEAR C43DC7 (base 16) NETGEAR 350 EAST PLUMERIA DRIVE SAN JOSE CALIFORNIA 95134 UNITED STATES Sorry! The public MA-L listing contains no match for the query 63-20-3D Please back up to the search page and try again. Sorry! The public MA-L listing contains no match for the query 20-62-3C Please back up to the search page and try again. Sorry! The public MA-L listing contains no match for the query 42-40-3A Please back up to the search page and try again.
If you're concerned (I would be, but I'm overly concerned about security), I would: