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Backward compatible means that a valid IPv4 address (127.0.0.1) should, by definition, be a valid IPv6 address. Hence IPv6 is definitely not backward compatibl

Backward compatible means that a valid IPv4 address (127.0.0.1) should, by definition, be a valid IPv6 address. Hence IPv6 is definitely not backward compatible.

merb 9y ago
but it is (even adding a prefix) means that it is backwards compatible in some way.
- efreak 9y ago
  Not as long as every preexisting application on your computer validates IP addresses and tells you that colons are not valid in IPs and domains.