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^{1 Some browsers prefer IPv4 over IPv6. See test-ipv6.com. This also is platform dependent.
2 In IPv6, web servers might see the MAC address of your computer, being 216:cbff:xx:xx in these examples. I'd rather not publish this super cookie on the net. See also How to avoid exposing my MAC address when using IPv6?
3 On a Mac: look for the value for scopeid in the output of ifconfig. On Windows: see the value for Idx in the output of netsh interface ipv6 show interface. I have seen this number change after reboots!
4 It seems this once led to an RFC which never made it out of draft. This draft proposes to use the plus-character instead, but this does not work on my Macs or Windows XP either.}

^{1 Some browsers prefer IPv4 over IPv6. See test-ipv6.com. This also is platform dependent.
2 In IPv6, web servers might see the MAC address of your computer, being 216:cbff:xx:xx in these examples. I'd rather not publish this super cookie on the net. See also How to avoid exposing my MAC address when using IPv6?
3 On a Mac: look for the value for scopeid in the output of ifconfig. On Windows: see the value for Idx in the output of netsh interface ipv6 show interface. I have seen this number change after reboots!
4 It seems this once led to an RFC which never made it out of draft. This draft proposes to use the plus-character instead, but this does not work on my Macs or Windows XP either.}

Final note: one might be fooled into using :: or ::ffff: followed by an IPv4 address, as specified in RFC 4291. But, this does not actually use IPv6, though it gives a response on my Mac:

Final note: one might be fooled into using :: or ::ffff: followed by an IPv4 address, as specified in RFC 4291. But, this does not actually use IPv6, though it gives a response on my Mac:

^{1 Some browsers prefer IPv4 over IPv6. See test-ipv6.com. This also is platform dependent.
2 In IPv6, web servers might see the MAC address of your computer, being 216:cbff:xx:xx in these examples. I'd rather not publish this super cookie on the net. See also How to avoid exposing my MAC address when using IPv6?
3 On a Mac: look for the value for scopeid in the output of ifconfig. On Windows: see the value for Idx in the output of netsh interface ipv6 show interface. I have seen this number change after reboots!
4 It seems this once led to an RFC which never made it out of draft. This draft proposes to use the plus-character instead, but this does not work on my Macs or Windows XP either.}

^{1 Some browsers prefer IPv4 over IPv6. See test-ipv6.com. This also is platform dependent.
2 In IPv6, web servers might see the MAC address of your computer, being 216:cbff:xx:xx in these examples. I'd rather not publish this super cookie on the net. See also How to avoid exposing my MAC address when using IPv6?
3 On a Mac: look for the value for scopeid in the output of ifconfig. On Windows: see the value for Idx in the output of netsh interface ipv6 show interface. I have seen this number change after reboots!
4 It seems this once led to an RFC which never made it out of draft. This draft proposes to use the plus-character instead, but this does not work on my Macs or Windows XP either.}