# Quick Answer: How do I calculate my host bit?

Contents

## How many bits is my Host ID?

The 8 bits of host ID is used to determine the host in any network. The default sub-net mask for class C is 255.255.

## How do I know what bit my mask is?

Calculate the subnet bits by looking at the final 8-bit binary word of the 32-bit binary subnet mask. If the final 8-bit binary word is 10000000, then there is one subnet bit and therefore 25 mask bits. If it is 11000000, then there are two subnet bits and therefore 26 mask bits.

## What is a host bit?

Host bits are the portion of an IP address that identify a specific host in a subnet. The subnet mask determines how much of the address is used for network bits and host bits.

## How many bits are in the host portion?

The host portion is like the house and street number. A subnet defines the number of bits, out of 32, used for the “network portion” of the address.

How to define the network portion of a subnet IP address.

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/24 255.255.255.0 11111111.11111111.11111111.00000000

## How do I find the host ID of an IP address?

Class A addresses: The first 8 bits of the IP address are used for the network ID. The final 24 bits are used for the host ID. Class B addresses: The first 16 bits of the IP address are used for the network ID. The final 16 bits are for the host ID.

## How many hosts are in a 30 subnet?

Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References

/32 255.255.255.255 1
/31 255.255.255.254 2
/30 255.255.255.252 4
/29 255.255.255.248 8

/ 26 64 62
/ 25 128 126
/ 24 256 254
/ 23 512 510

## How do you calculate the number of hosts in a subnet?

You can figure out how many hosts you can have in your subnet by subtracting the number of network bits from the number of total bits: in other words, 32 total bits, minus the number of network bits. Let’s use 26 as an example. A subnet with 26 network bits has six bits available for the host IP addresses.

## How do I find my network portion and host portion?

The subnet mask signifies which part of the IP address is network and which part is host. The subnet mask is compared to the IP address from left to right, bit for bit. The 1s in the subnet mask represent the network portion; the 0s represent the host portion.

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## How many hosts can a 23 network have?

For Class B Networks