# Should Subnet Mask Be The Same?

## What is the difference between default mask and subnet mask?

NOTE: All Class C Classful IP Addresses have a 24 bit subnet mask (255.255.

255.0).

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..

## Is subnet mask always 255?

All subnet masks must end in 0, 128, 192, 224, 240, 248, 252, 254, or 255—the values of each bit position as they are “turned on” left to right in any octet.

## What is a 255.255 0.0 subnet?

A subnet of 255.255. 0.0 would give you lots of hosts (approx 216) and 256 networks. A3 – the network has 8 bits and so does the node component. This means that you have have 28 =256 networks and 256 -2 = 254 hosts.

## 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 difference between subnet mask and wildcard mask?

– when we are calculating subnet mask we make network bits = 1 and host bits =0 . – Wildcard Mask can be calculated as network bits = 0 and host bits = 1 so we can say that wildcard mask is just oppsite to subnet mask. …

## How many IPs is a 16?

CIDR, Subnet Masks, and Usable IP Addresses Quick Reference Guide (Cheat Sheet)CIDRSubnet MaskTotal IPs/19255.255.224.08192/18255.255.192.016,384/17255.255.128.032,768/16255.255.0.065,53629 more rows•Aug 26, 2011

## What is a subnet mask used for?

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 is a Classful subnet?

Classful subnetting is a method of splitting a classful network number into two or more smaller subnets. The subnets will all be the same size, determined by the maximum number of hosts per subnet. A single custom subnet mask is used to configure the subnets.

## 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.

## How many subnets are in a 24?

Deducting 248 from 256 gives us 8 so the subnets are 0, 8, 16, 24, 32, 40, 48… 240,248. 192.168….2-3 Subnetting.Dotted Decimal ValueCIDR notation255.255.255.0/24255.255.255.128/25255.255.255.192/26255.255.255.224/2719 more rows•Dec 12, 2013

## How do I calculate subnet mask?

Total number of subnets: Using the subnet mask 255.255. 255.248, number value 248 (11111000) indicates that 5 bits are used to identify the subnet. To find the total number of subnets available simply raise 2 to the power of 5 (2^5) and you will find that the result is 32 subnets.

## What should subnet mask be?

Most home networks use the default subnet mask of 255.255. 255.0. However, an office network may be configured with a different subnet mask such as 255.255. … This is the default subnet mask used by Class B networks and provides up to 65,536 IP addresses (256 x 256).

## 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.

## What does the mask 255.255 0.0 tell you?

A subnet mask is used to tell the network devices (whether it be the computer or any routers, modems, etc.) … Likewise, if the subnet mask is 255.255. 0.0, then the computer will assume that every IP address in its local network will be in the format of 192.168. xxx.

## Can I change the subnet mask?

On the router’s web admin interface, look for an advanced settings category called LAN. In it, go to the LAN IP settings section or tab, and change the value of the Subnet Mask with the one you want.

## 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.

## Why is 192.168 always used?

The reason why most routers come setup with a Class C IP address is because it can still handle over 65,000 IP addresses, enough for just about any home or small business. The first usable address in the Class C network is 192.168. … Note that there are other private IP address ranges, such as 1.0. 0.0/8 and 2.0.