subnet calculator

 

The Subnet Calculator is a tool for determining essential details about IP networks. It simplifies the process of subnetting by providing users with the network address, first and last usable hosts, broadcast address, and total number of hosts based on a given IP address and subnet mask.

Common Subnet Mask Options

  • /32 (255.255.255.255): A single host address, typically used for point-to-point links.
  • /31 (255.255.255.254): Allows for two IP addresses, often used for point-to-point links.
  • /30 (255.255.255.252): Provides four addresses, two usable hosts, often used in small networks.
  • /29 (255.255.255.248): Offers eight addresses, six usable hosts, suitable for small subnetworks.
  • /28 (255.255.255.240): Gives sixteen addresses, fourteen usable hosts.
  • /27 (255.255.255.224): Yields thirty-two addresses, thirty usable hosts.
  • /26 (255.255.255.192): Results in sixty-four addresses, sixty-two usable hosts.
  • /25 (255.255.255.128): Provides one hundred twenty-eight addresses, one hundred twenty-six usable hosts.
  • /24 (255.255.255.0): Commonly used for local networks, offers two hundred fifty-six addresses, two hundred fifty-four usable hosts.
  • /16 (255.255.0.0): Suitable for larger networks, with sixty-five thousand536 addresses, sixty-five thousand534 usable hosts.
  • /8 (255.0.0.0): Often used for very large networks, with sixteen million addresses, sixteen million254 usable hosts.

Key Features

  • Network Address: The address identifying the subnet.
  • First Host: The first usable IP address within the subnet.
  • Last Host: The last usable IP address in the subnet.
  • Broadcast Address: The address used to send data to all devices within the subnet.
  • Total Hosts: The total number of usable IP addresses available in the subnet.

Examples of Subnet Calculations

  • Calculate the subnet details for the IP address 192.168.1.10 with a subnet mask of /24:
    • Network: 192.168.1.0
    • First Host: 192.168.1.1
    • Last Host: 192.168.1.254
    • Broadcast: 192.168.1.255
    • Total Hosts: 254
  • Determine the subnet details for 10.0.0.1 with a subnet mask of /16:
    • Network: 10.0.0.0
    • First Host: 10.0.0.1
    • Last Host: 10.0.255.254
    • Broadcast: 10.0.255.255
    • Total Hosts: 65,534