Subnet mask:
IP address:


Subnet mask in binary:
Number of IP addresses on the subnet:
Low IP address:
High IP address:

How this works:

Two IP addresses are on the same subnet if a binary OR of the subnet mask with each of the IP addresses gives the same result. This means that the lowest IP address on a subnet is the mask ORed with the IP address, the highest is the lowest address ORed with the inverse of the mask. That should now be as clear as mud.

Back to the javascript index.
Back to the front page.
xhtml css