Best way to see what websites clients access

Hi all,

Not my favourite topic to discuss but it has been suggested to me as something we need to impliment. What's the best way to impliment a way I can see what machines (IP/MAC) or even better AD accounts are accessing what websites? I'm not interested in what they're sending to the site, just to see what sites they access?

Our DHCP/DNS is handled by Windows Server 2012, i'm sure there is a feature built into the server to do this but wanted to get peoples opinion first.

Thanks!