Subnet Calculator
Subnet Details
Network Address
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Broadcast Address
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Subnet Mask
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Wildcard Mask
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First Host
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Last Host
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Total Hosts
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Usable Hosts
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IP Class
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Binary Mask
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What is Subnetting?
Subnetting is the process of dividing a network into smaller sub-networks (subnets). It allows efficient use of IP addresses and improves network performance by reducing broadcast traffic.
CIDR Notation
CIDR (Classless Inter-Domain Routing) notation expresses the subnet mask as a suffix, like /24. The number represents how many bits are used for the network portion. For example, /24 means the first 24 bits are the network address, leaving 8 bits for hosts (256 addresses, 254 usable).
Common Subnet Masks
| CIDR | Mask | Hosts |
|---|---|---|
| /24 | 255.255.255.0 | 254 |
| /25 | 255.255.255.128 | 126 |
| /26 | 255.255.255.192 | 62 |
| /27 | 255.255.255.224 | 30 |
| /28 | 255.255.255.240 | 14 |
| /16 | 255.255.0.0 | 65,534 |