How To Calculate A Netmask

• Calculate broadcast address and network address from an IP address and netmask

• Calculate a netmask from the mask length

• Calculate the mask length from the netmask

• Determine if a host is on the same network with a second host

 

Calculate broadcast address and network address from an IP address and netmask:

Enter your IP address:

 .. .

Enter your subnet mask: 

 .. .

Answer:

Broadcast Address: 

Network Address:

 

 

Calculate a netmask from the mask length:

Enter your netmask length: 

Answer:   .. .

 

 

Calculate the mask length from the netmask:

Enter your netmask: 

 .. .

Answer: 

 

 

Determine if a host is on the same network with a second host:

Enter your IP address: .. .
Enter your subnet mask: .. .
Enter the second host's IP address:  .. .

Answer: