IPv4 subnet calculator
Calculate an IPv4 network range, netmask, wildcard mask, usable-address bounds, and special-use classification locally.
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Subnet result
- Network CIDR
- Netmask
- Wildcard mask
- Network address
- Broadcast address
- First usable address
- Last usable address
- Total addresses
- Usable addresses
- Containing range
- Address semantics
Address classification
- Classification
- Matched block
Binary details
- Input address
- Netmask
- Wildcard mask
- Network address
- Broadcast address
Your input and results are processed only in this browser. They are not uploaded to or stored on a server.
How to use IPv4 subnet calculator
Enter an address with CIDR or dotted netmask. /31 follows RFC 3021 point-to-point semantics and /32 represents one address; classification applies to the entered address.
Private, local processing
Your input and results are not uploaded or stored. They remain in this browser tab.
Frequently asked questions
What does IPv4 subnet calculator do?
Calculate an IPv4 network range, netmask, wildcard mask, usable-address bounds, and special-use classification locally.
Is my data uploaded?
Your input and results are not uploaded or stored. They remain in this browser tab.
What should I check when using IPv4 subnet calculator?
Enter an address with CIDR or dotted netmask. /31 follows RFC 3021 point-to-point semantics and /32 represents one address; classification applies to the entered address.