Network Address Range - CIDR Notation - Explaination Please?
Posted on 2006-06-12
We are fixing to correct a lot of bad Entries from our SMTP BLOCK LIST in our Mail Server.
The following information we are needing to find out.
172.16.0.0 - 172.31.255.255 /12
If I was to enter the: 172.16.0.0 into our IP Field. And then Enter 172.31.255.255 into our MASK field.
Would that mean that it will look at and BLOCK out everything from 172.16.0.0 - 172.31.255.255
I am understanding that correctly?
10.0.0.0 - 10.255.255.255 /8 --> I add this in, and it BLOCKS everything in that range.
172.16.0.0 - 172.31.255.255 /12 --> This I am not sure about?
192.168.0.0 - 192.168.255.255 /16 --> This block everything in that range