Definition Subnetting

Definition Subnetting
Posted on August 22, 2011 by ilmushoru

so, what is subnetting?? According to the dictionary, subnetting is the division of a group of IP addresses to be part - smaller sections. The purpose in doing this subnetting are: 1. Divide the class into part of a network - a smaller part 2. Placing a host, whether it be in one network or not 3. Regularity.


Class A subnet: 11111111.00000000.00000000.00000000 (255.0.0.0) Class B subnet: 11111111.11111111.00000000.00000000 (255.255.0.0) Class C subnet: 11111111.11111111.11111111.00000000 (255.255.255.0)

Suppose a network with the IP network 192.168.10.0 want to divide into 5 small networks (48 hosts each), which means to do subneting processes in the network. The first step to do is to divide the network IP (192.168.10.0 <- class C) into blocks, each of which must be at least 48 hosts. As we know that each class C has 255 IP then the calculation is as follows: 255/5 = 51 Each subnet has 49 IP addresses (each taken 2 to IP broadcast and IP networks). Here is a grouping of these networks:

192.168.10.0 - 192.168.10.50 used by network 1

192.168.10.51 - 192.168.10.101 used by network 2

192.168.10.102 - 192.168.10.152 used by network 3

192.168.10.153 - 192.168.10.203 network used by 4

192.168.10.204 - 192.168.10.224 network is 5

Subnetting is needed to host on a network can not access other hosts on the network directly. For the distribution of 51 hosts; 51 = 00110011 (binary). Highest value of 8 bits of subnetting a class C is: 255 = 11,111,111. 00110011

________ (Negation)

11001100 (8 bits of class C subnet) = 204 So its IP subnetmask: 255 255 255 204

(Hacker Dictionary: Dony Ariyus)