On Sun, Nov 05, 2000 at 08:46:05PM +1100, Damien wrote:
> >
> > a.b.c.d
> >
> > n = d + c * 256 + b * 256 ^ 2 + a * 256 ^ 3
>
> after reading the previous mail, this is what i was thinking. i went to test
> it in perl afterwards, but got the wrong result. could anyone tell me what's
> wrong with my interpretation?
>
> perl -le '$, = "."; print unpack("C4", "2704935062");'
Notice what you're getting: "50.55.48.52", which is ASCII code for
"2704". You have to convert the string "2704935062" into the integer
2704935062 in network byte order.
perl -le 'print join(".", unpack("C4", pack("N", $ARGV[0])))' 2704935062
Going the other direction isn't too difficult, either:
perl -le 'print unpack("N", pack("C4", split("\\.", $ARGV[0])))' 127.0.0.1
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