They need an IPv4 addresses unique to that network only. Computers which are not connected directly to the Internet do not need globally-unique IPv4 addresses. Networks belongs to 'Class C' from 192.168.0.0 to 192.168.255.255 are reserved for private use and can be used inside any organization. Reservation of IP addresses in Class C networksĪn important IP address reservation in Class C IPv4 addresses is private networks, from 192.168.0.0 to 192.168.255.255. Since the default structure of a Class C IP address is, the default subnet mask of a Class C IP address is 255.255.255.0. If the left most octet is between (and including) 192 and 223, it is a Class C IP address. You can easily identify a Class C IP address by looking at its left-most octet. Most-significant bits in the left-most octet are marked inside an orange rectangle in below image. Note that three most-significant bits in left-most octet of a Class C network IP address are reserved as '110'. Also note that the starting Class C IP address is 192.0.0.0 and last Class C IP address is 223.255.255.255.įollowing image shows the range (minimum and maximum possible values) of left-most octet of a Class C network IP address. Therefore for a 'Class C' IPv4 address, left-most octet must have a value between 192 and 223 (192.0.0.0 to 223.255.255.255). The minimum possible value for the left-most octet in binaries is 11000000 (decimal equivalent is 192) and the maximum possible value for the left-most octet is 11011111 (decimal equivalent is 223). There are a small number of custom subnets that divide on octet boundaries as well. Note that while all default subnet masks use only 255 and 0, not all subnet masks with 255 and 0 are defaults. Since the three left-most bits (also called as high-order bits or most-significant bits) of the first octet (left-most octet) of a Class C network IPv4 address are reserved as '110', the 32 bits of a 'Class C' address can be represented as . So, the three default subnet masks are 255.0.0.0 for Class A, 255.255.0.0 for class B, and 255.255.255.0 for Class C. The default subnet mask of a Class C IP address is 255.255.255.0. The structure of a Class C IP address is. The left-most three octets of a Class C network IP address belongs to the network part and the last one octet belongs to the host part. IPv4 Protocol, IPv4 header and fields of IPv4 header.Binary Decimal and Hexadecimal numbers and conversions.I strongly suggest you to visit and learn below lessons before you continue learning more about Class C networks and Class C IP addresses.

The left-most three bits (also called as high-order bits or most-significant bits) of the left most octet of a 'Class C' network is reserved as '110'.The default structure of a Class C IP address is.First three octets of a 'Class C' network IP address is used to identify the 'Network part' and the remaining one octet is used to identify a host uniquely within that network.Please note below important points about Class C network IP addresses. 'Class C' IPv4 addresses are used for small-sized networks. Class C networks and Class C IP addresses

Class c subnet mask table