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CIDR (Classless Inter-Domain Routing) Notation is used in a limited role on the switchvox.  It can be found in:

  1. subnet masking ( Server > IP Config )

  2. Phone Networks ( Server> Phone Networks )

  3. Access Control ( Server > Access Control )

Wikipedia defines CIDR notation as:

"CIDR notation is a compact representation of an IP address and its associated routing prefix. The notation is constructed from the IP address and the prefix size, the latter being equivalent to the number of leading 1 bits in the routing prefix mask. The IP address is expressed according to the standards of IPv4 or IPv6. It is followed by a separator character, the slash ('/') character, and the prefix size expressed as a decimal number."

Basically it's a handy way to identify or select entire blocks of IP addresses by octet.

A common example you may see for your internal network is 192.168.0.0/24
This example will identify or select all IP addresses in the 192.168.0.X scheme. 
ex:  192.168.0.1 will fall into this category where 192.168.1.1 will not

The /24 in the example is locking in the first 3 octets of the ip address.  If we updated that number to /16 it would only secure the first two octets.
ex:  192.168.0.0/16 will identify or select both 192.168.0.1 AND 192.168.1.1

To create a rule for a SINGLE IP address, which is common with public networks, use the CIDR /32
ex:  173.227.23.2/32  will only identify or select the ip address 173.227.23.2 and no others.

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