In a great many cases, malware can grab your MAC address now. Which is, as it happens, a 48-bit globally unique address. IPv6 addresses are a major PITA, not

In a great many cases, malware can grab your MAC address now. Which is, as it happens, a 48-bit globally unique address. IPv6 addresses are a major PITA, not only are they too long, they're impossible to write and get even most technically competent people to understand. They're almost as hideous and unusable as x.400 email addresses...