How to determine IP range given Subnet mask

Given a computer has an IP address of and a subnet mask of how do I find the range of IP addresses on this subnet?

In the subnet mask, find the first octet that is not a 255. In your example, its the 4th octet, and its 240. So take 256 and subtract 240, which gives us 16. So you now know that these networks, the 192.168.1.x networks, all have a range of 16. So just start listing them…

Here we can stop. Your address, falls into the .96 network. .96 encompasses all ip addresses from to, because we know that starts the next network.
Understanding the /24 after the IP
Subnet Table


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s