As long as you don't use RFC1918 addresses, the IPv4 address(es) of the host should be unique for the Internet. Append/prepend a 32 bit timestamp and you have a 64bit unique identifier that is "universally" unique (to one second).
Remember that /sbin/ifconfig output usually include MAC address too. Not that MAC addresses are 100% unique, but that should increase the uniqueness.
-- dave
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