NETWORK TOOL · CIDR
Subnet Calculator
Calculate network address, broadcast, host range, subnet mask, wildcard and CIDR – instantly for IPv4 and IPv6.
Quick pick
192.168.1.0/24
192.168.1.0 – 192.168.1.255
192.168.1.0/24IP address
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Network
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Broadcast
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Subnet mask
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Wildcard mask
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Host range
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Usable hosts
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Total addresses
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IP class
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Type
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CIDR
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Hex
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Binary representation
Network bits in orange, host bits in grey.
All subnet masks
Click a row to use that mask.
| CIDR | Mask | Wildcard | Usable hosts | Total |
|---|
Understanding subnets
The essentials of CIDR and subnet masks.
CIDR notation
CIDR (Classless Inter-Domain Routing) uses a slash and a prefix length to describe how many leading bits identify the network.
Subnet mask
A 32-bit number where 1-bits mark the network portion and 0-bits mark the host portion of an IPv4 address.
Network & broadcast
The first address of a subnet is the network address, the last is the broadcast address. Both cannot be assigned to hosts.
Usable hosts
For /0 to /30 you get 2host bits − 2 usable hosts. For /31 and /32 special rules apply (RFC 3021).