$ gem install ipaddress
$ ruby -r ipaddress -e "puts IPAddress('2404:6800:400a:804::2004').data.unpack('C16').join('.')"
36.4.104.0.64.10.8.4.0.0.0.0.0.0.32.4
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February 8, 2016 04:06
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ipv6 to decimal
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mapのところを短く修正
ruby -r ipaddr -e "p IPAddr.new('2404:6800:400a:804::2004').to_string.gsub(':','').scan(/.{2}/).map(&:hex).join('.')"