![]() We have to borrow from the 8-bits available in the host octet. This means we only have 8-bits available for host addresses because IPv4 is only 32-bits in length (i.e. A ‘/24’ bit network means our subnet mask first 24-bits are on (or made to 1). Our team lead informed us that our IP address is a ‘/24’ bit network. We need to first convert our IP address and the subnet mask to binary format. IP subnetting example Step 1ĭetermine how many HOST bits is needed to create nine subnets from IP address using our valid subnet formula: **IMPORTANT: Always borrow from HOST bits when subnetting an IP address. Where N is equal to number of bits borrowed These four formulas will help us provide our team lead with the network address, broadcast address, range of valid hosts and the new subnet mask. To complete this request, we can use the four basic formula every network engineer uses. ![]() He wants the network address, broadcast address, range of valid hosts along with the new subnet mask. You receive an email from your team lead that requests nine subnets to be created for IP address ‘192.168.110.0’ with subnet mask of ‘/24’. Our subnet mask 255.255.255.0 can be represented in binary format as: Our IP address 192.168.10.24 can be represented in binary format as: For example using our binary conversion table above, we can convert the IP address 192.168.10.24 into its binary format by: We can convert each separated dotted decimal number into binary by just turning on the bits (making them a 1) that would add up to the value in each of our octet. Let’s say we want to represent IP address 192.168.10.24 in binary format. Let’s use this table in a real world scenario. Each of the bit in an octet has a binary weight defined as following: An IP address is 32-bit in length, separated by a dot into a group of four 8-bit octet. ![]() Converting our dotted decimal IP address into binary is accomplished by turning on the bits until the value adds up to the octet decimal number. Now that we understand the benefits of subnetting, let start converting dotted decimal numbers into its binary form.
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