Cisco 7604 Configuration Guide - Page 690
Class C-Size Network Address, Subnet with Mask /29 255.255.255.248, Address Range
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IPv4 Addresses and Subnet Masks Appendix E Addresses, Protocols, and Ports Class C-Size Network Address For a network between 2 and 254 hosts, the fourth octet falls on a multiple of the number of host addresses, starting with 0. For example, the 8-host subnets (/29) of 192.168.0.x are as follows: Subnet with Mask /29 (255.255.255.248) Address Range1 192.168.0.0 192.168.0.0 to 192.168.0.7 192.168.0.8 192.168.0.8 to 192.168.0.15 192.168.0.16 192.168.0.16 to 192.168.0.31 ... ... 192.168.0.248 192.168.0.248 to 192.168.0.255 1. The first and last address of a subnet are reserved. In the first subnet example, you cannot use 192.168.0.0 or 192.168.0.7. Class B-Size Network Address To determine the network address to use with the subnet mask for a network with between 254 and 65,534 hosts, you need to determine the value of the third octet for each possible extended network prefix. For example, you might want to subnet an address like 10.1.x.0, where the first two octets are fixed because they are used in the extended network prefix, and the fourth octet is 0 because all bits are used for the host number. To determine the value of the third octet, perform the following steps: Step 1 Step 2 Calculate how many subnets you can make from the network by dividing 65,536 (the total number of addresses using the third and fourth octet) by the number of host addresses you want. For example, 65,536 divided by 4096 hosts equals 16. Therefore, there are 16 subnets of 4096 addresses each in a Class B-size network. Determine the multiple of the third octet value by dividing 256 (the number of values for the third octet) by the number of subnets: In this example, 256/16 = 16. The third octet falls on a multiple of 16, starting with 0. Therefore, the 16 subnets of the network 10.1 are as follows: Subnet with Mask /20 (255.255.240.0) Address Range1 10.1.0.0 10.1.0.0 to 10.1.15.255 10.1.16.0 10.1.16.0 to 10.1.31.255 10.1.32.0 10.1.32.0 to 10.1.47.255 ... ... 10.1.240.0 10.1.240.0 to 10.1.255.255 1. The first and last address of a subnet are reserved. In the first subnet example, you cannot use 10.1.0.0 or 10.1.15.255. Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM E-4 OL-20748-01
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