A subnet mask doesn’t represent any device or network on the Internet. It’s just a way of indicating which portion of an IP address should be used to determine the network ID. (You can spot a subnet mask right away because the first octet is always 255 , and 255 is not a valid first octet for any class of IP address.)

Jan 10, 2019 · Which of the following ip addresses have a default subnet mask of What is the prefix length notation for the subnet mask 255.255.255.224? Using cidr notation, the subnet mask 255.255.255.0 would be written as Subnet mask 255.255.255.0 What does the ip address of 10.240.0.0 with a subnet mask of 255.255.255.0 represent? Default subnet mask for Class A = 255.0.0.0; Default subnet mask for Class B = 255.255.0.0; Default subnet mask for Class C = 255.255.255.0 . Also Read-Classes of IP Address . Note-02: Network size is the total number of hosts present in it. Networks of same size always have the same subnet mask. Networks of different size always have the An Internet protocol (IPv4) address consists of 32 bits, separated into four 8-bit binary words. When calculating subnet bits, you are attempting to determine the number of hosts available in a subnet based upon the subnet mask. This mask, or the mask bits, display how many hosts are available in the binary IP address. A subnet mask is 32 bits numbers in which the series of 1’s represents the Network ID part and the Subnet ID part whereas the series of 0’s represents the Host ID part. So, in the above example of the Class C IP address, we represent all the network ID bits by 1 . The explanation of how the subnet mask works is sub-optimal. The host determines where to send an IP datagram by first determining the source and destination network. Those values are calculated by converting the subnet mask plus source/destination addresses to binary. Then the network is calculated by a binary AND operation between first the If the subnet mask example is 255.255.255.0, and since 255 in binary notation equals 11111111, so the subnet mask is: 11111111.11111111.11111111.0000000. Lining up the IP address and the subnet mask together, the network and host portions of the address can be separated: 11000000.10101000.01111011.10000100 -- IP address (192.168.123.132 Computers use it to determine the network part and the host part of an address. The 1s in the subnet mask represent a network part, the 0s a host part. Computers works only with bits. The math used to determine a network range is binary AND. Let’s say that we have the IP address of 10.0.0.1 with the default subnet mask of 8 bits (255.0.0.0).

## The subnet mask is a binary pattern, and the default mask found in countless small local networks indicates that all the machines are in the same network (see below). See subnet, IP address and

IP Subnet Calculator. This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others. subnet mask (subnetting): A subnet mask is a 32- or 128- bit number that segments an existing IP address in a TCP/IP network and divides that address into discrete network and host addresses. The process of subnetting can further divide the host portion of an IP address into additional subnets to route traffic within the larger subnet . 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 Subnet Mask Cheat Sheet If you are a network admin like us, this is a little sheet that you will continually need access to. We hope you find it as helpful as we do.

### ABOUT SUBNET CALCULATOR. The subnet calculator lets you enter a subnet range (CIDR) and see IP address information about that range You can type your range directly in CIDR notation, or use the optional Mask pull-down: 74.125.227.0/29; 74.125.227.0, then select Optional Mask from dropdown

If a subnet doesn't have a route to the internet gateway, but has its traffic routed to a virtual private gateway for a Site-to-Site VPN connection, the subnet is known as a VPN-only subnet. In this diagram, subnet 3 is a VPN-only subnet. Oct 17, 2019 · The CIDR number comes from the number of ones in the subnet mask when converted to binary. The common subnet mask 255.255.255.0 is 11111111.11111111.11111111.00000000 in binary. This adds up to 24 ones, or /24 (pronounced ‘slash twenty four’). A subnet mask of 255.255.255.192 is 11111111.11111111.11111111.11000000 in binary, or 26 ones