Quick Answer: What Does The Subnet Mask Mean?

What is subnet mask and why it is used?

A subnet mask is used to divide an IP address into two parts.

One part identifies the host (computer), the other part identifies the network to which it belongs.

To better understand how IP addresses and subnet masks work, look at an IP (Internet Protocol) address and see how it is organized..

What does a subnet mask of 255.255 255.0 mean?

Example: A class C network would have a subnet mask of 255.255. 255.0 which means that 24 bits are used for the network. In CIDR notation this is designated by a /24 following the IP address. … IP address 192.168.

What is Subnet Mask example?

Subnet masks are also expressed in dot-decimal notation like an address. For example, 255.255.255.0 is the subnet mask for the prefix 198.51.100.0/24. Traffic is exchanged between subnetworks through routers when the routing prefixes of the source address and the destination address differ.

How many subnets are there?

Class CNetwork BitsSubnet MaskNumber of Subnets/24255.255.255.00/25255.255.255.1282 (0)/26255.255.255.1924 (2)/27255.255.255.2248 (6)3 more rows

How do you find the subnet mask?

255.248 or /29.STEP 1: Convert to Binary.STEP 2: Calculate the Subnet Address. To calculate the IP Address Subnet you need to perform a bit-wise AND operation (1+1=1, 1+0 or 0+1 =0, 0+0=0) on the host IP address and subnet mask. … STEP 3: Find Host Range. … STEP 4: Calculate the Total Number of Subnets and Hosts Per Subnet.

What is IP address and subnet mask?

An IP address is an address used in order to uniquely identify a device on an IP network. The address is made up of 32 binary bits, which can be divisible into a network portion and host portion with the help of a subnet mask. The 32 binary bits are broken into four octets (1 octet = 8 bits).

What are the 4 parts of an IP address?

IPv4 addresses are usually represented in dot-decimal notation, consisting of four decimal numbers, each ranging from 0 to 255, separated by dots, e.g., 172.16.254.1. Each part represents a group of 8 bits (an octet) of the address.

Should subnet mask be the same?

Subnet masks always work from left to right. Devices are said to be within the same subnet if their IP Address starts with the same digits, but ends with a different set of digits. … If the subnet mask is 255.255. 255.0, then the first three octets of all devices must be the same.

What is the difference between default mask and subnet mask?

All Class A Classful IP Addresses have an 8 bit subnet mask (255.0. 0.0). On the other hand, the use of an IP Address with a subnet mask other than the default results in the standard Host bits (the Bits used to indentify the HOST ID) being divided in to two parts: a Subnet ID and Host ID.

Why do we need subnet mask?

Also to be clear the purpose of the subnet mask is to determine which hosts are on the local network and which are outside of the network. Hosts can talk directly to hosts on the same network, but they need to communicate with a router to talk to hosts on external networks.

How do subnets work?

Subnetting works by applying the concept of extended network addresses to individual computer (and another network device) addresses. … But because this is a Class C network, the default subnet mask of 255.255. 255.0 allows all computers on the network to be peers (to send messages directly to each other) by default.

How do you create a subnet?

In the Subnets tab, click Create. In the Create Subnet dialog box, specify subnet details, such as the name, subnet IP address or subnet mask, range of IP addresses, gateway address, and broadcast domain. You can specify the IP addresses as a range, as comma-separated multiple addresses, or as a mix of both.

What happens if subnet mask is wrong?

If the netmask is wrong, the program tries to directly access sites where it has to go through the router, or vice versa. The netmask defines, which part of the IP-address is used as address for the network and which part is used for the workstations. Both IPs are in the same net.

What destination adress is 255.255 255.255 for?

A special definition exists for the IP address 255.255. 255.255. It is the broadcast address of the zero network or 0.0. 0.0, which in Internet Protocol standards stands for this network, i.e. the local network.

What is a good subnet mask?

This is a simplistic explanation, good enough for handling a subnet like 192.168. 0.1 with a mask short hand value of /24 thru /32 (long hand 255.255. 255.0 thru 255). The subnet calculator can determine the range of the clients local network by its IP address and network mask.

Why do we need IP addresses?

An Internet Protocol address, or IP address is a unique identifier given to every machine in a network. An IP address serves two primary functions. … Because an IP address is a unique identifier, it allows computers to send and receive information to and from specific computers in a given network.