Take the 2-minute tour ×  when I visit a website, the website
gets my ip address.  Does it get any other info, i.e., MAC?  My
ISP is TWC.  share|improve this question  3 Answers 3  Packets
containing your MAC would not leave your router. Outgoing
traffic from your router will have the router's WAN MAC address,
and this will change for each hop the packet takes until it's
final destination.  Besides IP address, there's a wealth of
information sites can get from browser, Java, and Adobe Flash
APIs, such as OS version and other attributes. MAC address
directly cannot be one of them unless you have a bizarre browser
plugin that would collect that info through your browser for
some reason.  share|improve this answer Also worth noting that
the MAC address can sometimes be extracted from the IPv6 address
if you are accessing a website using that –  MikelR Oct 2 '13 at
22:58 @MikelR I was about to add this as well. In IPv6, the
interface identifier, which is transmitted publicly, may be
generated based off of the mac