function reverse_ipv4 --description "Print reverse IPv4 address" -a ipv4addr

set -l i '4'
set -l rquad '' '' '' ''

for item in (string split --right --max 3 . $ipv4addr)
 set rquad[$i] $item
 set i (math $i-1)
end

echo "$rquad[1].$rquad[2].$rquad[3].$rquad[4]"

end