In the following diagram, there is a subnet mask for a Class C address. The subnet mask is 255.255.255.128 which, when translated into bits, indicates which bits of the host part of the address will be used to determine the subnet number. Of course, more bits borrowed means fewer individually addressable hosts that can be on the network.

The subnet calculator allows the use of a single subnet bit - for example, a class C address with a subnet mask of 255.255.255.128 is permitted. The subnet calculator allows a subnet ID to have its final octet equal to the final octet of its subnet mask - for example, a class C network address of 192.168.0.192 with a subnet mask of 255.255.255 An IP address is always used with Subnet mask. Without subnet mask an IP address is an ambiguous address and vice versa. Both IP address and Subnet mask consists 32 bits. These bits are divided in four octets. Octets are separated by periods and written in a sequence. A Subnet mask can be written in two ways; in full form and in abbreviated form. Aug 17, 2019 · Allocate the First highest subnet Assign 192.168.10.20 mask /25 for subnet A to satisfy there need for 66 hosts. The last octet of the subnet mask will be 1000000 (255.255.255.128) Assign the next highest subnet Assign 192.168.10.128 the mask /27 for subnet C; the last octet of the subnet mask will be 11100000 (255.255.255.224) Apr 16, 2020 · An iterative procedure to obtain the adjacent subnet addresses might be: Step 1: Get the IPv6 address; Step 2: Find the subnet start address; Step 3: Find the subnet end address; Step 4: Increment the subnet end address by one. The start address of the next subnet obtained. Step 5: Go to step 3 with the address found in Step 4

## In IPv6, the network prefix performs a similar function as the subnet mask in IPv4, with the prefix length representing the number of bits in the address. Prior to the introduction of CIDR, IPv4 network prefixes could be directly obtained from the IP address based on the class (A, B, or C, which vary based on the range of IP addresses they

IPv4 Address Structure with a Subnet Mask Example 2. 06:18. IPv4 Address Structure Quiz B. 4 questions. Explanations to IPv4 Address Structure Quiz B. 11:08. CIDR Properly create subnets. Don’t scramble for new IPs later with Subnet Calculator. CIDR notation made easy. Simple | Smart | 100% Free | Trusted by 6M IT Pros

### Jun 10, 2020 · If you take a class c network as an example the starting subnet mask is 255.255.255.0 The lower 8 bits you can use for subnetting. if you use 4 bits for the sub network and 4 for hosts you get a subnet mask of 255.255.255.240 128+64+32+16=240 the network uses the high order bits anyway 4 are for the network. With 4 bits you can have 16 values

What I do understand is that almost every small network uses a subnet mask of 255.255.255.0 and this allows for 255 IP addresses on that network. Let's say this network is 10.0.0.1-255. /22 is 4 /24's or 2 /23's or 1024 ips and hte subnet mask is 255.255.252.0 Also like for a /22 to find the 3rd octet its 4 cblocks - 256 = 252 /32 is 1 ip /31 is 2 ips /30 is 4 ips etc. Before the test you probably want to right down /16 - /32, what the subnet mask is for those, and how many ips there. HTH