![]() This value represents the number of hosts per Supernet. For example, the /24 CIDR Block, 255.255.255.0 Supernet mask is 1 Class C Network, whereas a /20 CIDR Block, 255.255.240.0 Supernet mask is 16 Class C networks. This number shows us how many Class C Networks are combined by using a specific Supernet mask or, if you like, CIDR Block. To understand the coversion of binary bits to decimal numbers, read our article How Supernets Work. For example, a CIDR block of /24 means a 24bit subnet mask, which translates to 255.255.255.0. It's also the decimal value the CIDR Block specifies. When you configure the devices that will be attached to the specified network, this is the value you will enter as a subnet mask. The Supernet Maskīasically, this is your subnet mask. With CIDR Blocks /25 to /30 we are actually subnetting and not Supernetting.ĬIDR blocks of /30 (4 IP addresses of which 2 are usable) are often assigned by ISPs to their customers and used to assigned their only two valid IP addresses to the equipment between the ISP and customer (usually routers or firewalls). When we use a CIDR Block of 24 (24 bit subnet mask) we are not Supernetting because this is a default subnet mask for a Class C network. These blocks are highlighted in blue and yellow. ![]() We should also take note at the CIDR Block entries /24, and /25 to /30. For example, /14 means 14 bits assigned to the subnet mask. The CIDR Block simply represents the number of bits used for the subnet mask. Supernetting requires solid understanding of IP, subnetting and binary notation. Note: Green coloured entries represent supernetting, blue is the default Class C network and yellow entries represent subnetting.
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