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Subnet Calculator | |
Network ClassA B C | First Octet Range |
IP Address | Hex IP Address |
Subnet Mask255.255.255.0 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.240 255.255.255.248 255.255.255.252 | Wildcard Mask |
Subnet Bits0 1 2 3 4 5 6 | Mask Bits24 25 26 27 28 29 30 |
Maximum Subnets1 2 4 8 16 32 64 | Hosts per Subnet254 126 62 30 14 6 2 |
Host Address Range | |
Subnet ID | Broadcast Address |
Subnet Bitmap |
IP Subnet Calculator
The IP Subnet Mask Calculator enables subnet network calculations using network class, IP address, subnet mask, subnet bits, mask bits, maximum required IP subnets and maximum required hosts per subnet.
Results of the subnet calculation provide the hexadecimal IP address, the wildcard mask, for use with ACL (Access Control Lists), subnet ID, broadcast address, the subnet address range for the resulting subnet network and a subnet bitmap.
For classless supernetting, please use the CIDR Calculator. For simple ACL (Access Control List) wildcard mask calculations, please use the ACL Wildcard Mask Calculator.
About the Subnet Calculator
- The subnet calculator implements a classful / classed IP addressing scheme where the following rules are adhered to:
- Class A addresses have their first octet in the range 1 to 126 (binary address begins with 0).
- Class B addresses have their first octet in the range 128 to 191 (binary address begins with 10).
- Class C addresses have their first octet in the range 192 to 223 (binary address begins with 110).
- The subnet calculator allows the use of a single subnet bit - for example, a class C address with a subnet mask of 255.255.255.128 is permitted.
- The subnet calculator allows a subnet ID to have its final octet equal to the final octet of its subnet mask - for example, a class C network address of 192.168.0.192 with a subnet mask of 255.255.255.192 is permitted.
The above is generally accepted as being 'normal', however, certification students should keep in mind that, in some certification programs, the final two points are regarded as inacceptible.
For classless subnetting, you can use the CIDR calculator.
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