# What Should My Subnet Mask Be?

## Why do we need subnet mask?

– A subnet mask allows identification of host part and network part of an IP address.

– Subnet mask is utilized for isolating the network id and host ids.

– This is to reduce the broadcast domain or to reduce heavy network traffic.

## How do I find my custom 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 Subnet example?

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. A router serves as a logical or physical boundary between the subnets.

## How many Subnet Masks are there?

threeIntroduction to Networking In IPv4 there are three default subnet masks corresponding to the three classes of IP addresses (as illustrated earlier). There are currently three ways of showing the subnet masks for IPv4 addresses; you can show them in dotted decimal, binary, or classless interdomain routing (CIDR).

## What is a 255.255 254.0 subnet?

It means that you decided to use the last 8 bits of the address for your devices. 8 binary bits gives you 256 decimal, so you can have 256 addresses for the devices on your network ranging from 192.168. … You change the network mask to 255.255. 254.0. Now you have 9 bits for your devices (254 is 11111110).

## What is Subnet Mask example?

You can determine the number and type of IP addresses any given local network requires based on its default subnet mask. An example of Class A IP address and subnet mask would be the Class A default submask of 255.0. 0.0 and an IP address of 10.20.

## Can a subnet mask be anything?

A subnet mask hides, or “masks,” the network part of a system’s IP address and leaves only the host part as the machine identifier. A common subnet mask for a Class C IP address is 255.255. 255.0. … The last section of each computer’s IP address can be anything from 0 to 255.

## What is a 16 subnet?

The number 16 is the first subnet and also your block size. … The valid subnets in this example are 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224. As another example, if you had a Class A subnet mask of 255.255. 240.0, you’d use the mask on the second and third octets minus 256.

## What is router subnet mask?

A subnet mask is a number that defines a range of IP addresses available within a network. A single subnet mask limits the number of valid IPs for a specific network. … Systems within the same subnet can communicate directly with each other, while systems on different subnets must communicate through a router.

## What is the best subnet mask to use?

Let’s start with the standard, typical mask for a home LAN, 255.255. 255.0. It typically permits 254 clients on a LAN connected to the IPNetRouter gateway (eg x.y.z.1-x.y.z.254 are good IPs to use on the x.y.z subnet with mask 255.255.

## 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 address and see how it’s organized.

## What does the mask 255.255 0.0 tell you?

A subnet mask of 255.255. 255.0 would give you lots of networks (2 16) and 254 hosts. A subnet of 255.255. 0.0 would give you lots of hosts (approx 216) and 256 networks.

## What is my subnet mask and gateway?

Use the IPCONFIG Command Type “ipconfig” at the prompt and press “Enter.” This command displays all network interfaces and their configurations, including IP addresses, subnet masks and default gateway.

## How do I find my IP and subnet gateway?

In the Windows search fields, type cmd, to open command prompt.Press Enter.Type ipconfig/all press Enter.Find your network settings.Your PC’s IP address and your network Subnet Mask and Gateway will be listed.

## What is my IP and gateway?

Using Command Prompt Press the Win + R keys on your keyboard. Type cmd and press Enter. Type ipconfig command in the Command Prompt window. Find your gateway IP address listed next to Default Gateway.

## What are the 4 parts of an IP address?

IP Address ComponentsAddress Class. Early in the development of IP, the IANA (Internet Assigned Numbers Authority) designated five classes of IP address: A, B, C, D, and E. … Default Subnet Mask. … The Network Field. … The Host Field. … Non-default Masks. … The Subnet Field.

## What happens when you change the subnet mask?

If you change the subnet mask on the statically-configured devices at the same time as you change the subnet mask on DHCP server(s) then you’ll see no changes in behaviour. If you leave devices with the old subnet mask they’ll only be able to talk to devices that still have addresses in the old subnet’s range.