Hello,
On Fri, Oct 5, 2001, 15:55:02 GMT
Stefan Jeglinski, <[EMAIL PROTECTED]> wrote:
>There doesn't appear to be any way to use the IP/n notation to
>describe certain small blocks of IPs.
>
>For example, to denote the BellSouth adsl block
>216.77.224.1-216.77.254.254, I can conveniently use (AFAICT)
>
>216.77.224.0/19
>
>OTOH, if I want to denote another BellSouth block
>216.77.200.1-216.77.223.254 (about the same size), there appears to
>be no convenient IP/n description.
>
>
>Am I right here?
First, it helps to include the network and broadcast addresses into the range:
216.77.200.0-216.77.223.255
In binary:
200 = 0xC8 = 0b11001000
223 = 0xDF = 0b11011111
^ because of this bit we need more than one range
Two ranges: 0b11001000 -> 0b11001111 == 0xC8 -> 0xCF == 200 -> 207
0b11010000 -> 0b11011111 == 0xD0 -> 0xDF == 208 -> 223
216.77.200.0-216.77.223.255 ==
{ 216.77.200.0-216.77.207.255, 216.77.208.0-216.77.223.255 } ==
{ 216.77.200.0/20, 216.77.208.0/19 }
Best regards,
Dmitry Akindinov
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