CTI 2572-B / 2500C-2572-B Installation and Operation Manual 106
Converting between CIDR and Dotted Decimal Notation
Classless Inter-Domain Routing (CIDR) notation specifies the subnet mask by number of bits that are set in the
subnet mask. These bits represent the IP network identifier. Since all bits in the network ID must be
contiguous, there are a limited number of possibilities. See the following table to convert between CIDR and
Dotted Decimal notation.
* Not allowed for CTI products
Selecting an IP Address
In order to perform its functions, the 2572-B requires a fixed IP address. If you are connecting to an existing
network, you should obtain an unused static IP address and the network subnet mask from the network
administrator.
If you are establishing your own IP addresses, you should select IP addresses from a block of ‘private”
addresses established by the Internet Assigned Numbers Authority (IANA). The private address blocks are:
• 10.0.0.0 through 10.255.255.255 (Class A)
• 172.16.0.0 through 172.31.255.255 (Class B)
• 192.168.0.0 through 192.168.255.255 (Class C)
These addresses will not be forwarded by the Internet backbone routers; therefore, you are free to use any
address in this group as long as it does not conflict with the usage by your local organization.
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