This number after the slash is a count of the leftmost one bits in the net
mask, i.e.

  /8 is the same as net mask 255.0.0.0
  /24 is the same as net mask 255.255.255.0

So, for example, the rfc-1918 addresses are:

 10/8        (10.0.0.0-10.255.255.255)
 172.16/12   (172.16.0.0-172.31.255.255)
 192.168/16  (192.168.0.0-192.168.255.255)

This is a more efficient way to describe subnets and is expandable to IPv6.

-----Original Message-----
From: Jules <[EMAIL PROTECTED]>


|This is a newbie question, I've checked almost every resource available to
|me, but I still don't really grasp this concept, so if anyone can clarify
|it for me, I'd be grateful.
|
|How does one read addresses like 172.168.10/24 or 172.16.51.50/32 ?
|
|In particular, what does the slash signify what does it do in the above
|case(s).


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