Network

IPv4 subnet calculator

Calculate CIDR, masks, host ranges, and address counts, including /0, /31, and /32.

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IPv4 address and CIDR / netmask (defaults to /24)

Result

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Using this tool

Calculate network boundaries and host ranges from IPv4 and a mask.

Actions: Calculate subnet · Previous subnet · Next subnet

Example

Use a documentation address to obtain its /24 network, broadcast, and host range.

Example action and settings

Action: Calculate subnet

Input / action

192.0.2.25/24

Result / expected behavior

Input address: 192.0.2.25
Prefix length: 24
Network address: 192.0.2.0
Last address / broadcast: 192.0.2.255
Subnet mask: 255.255.255.0
Wildcard mask: 0.0.0.255
Total addresses: 256
Usable hosts: 254
First usable address: 192.0.2.1
Last usable address: 192.0.2.254
Network CIDR: 192.0.2.0/24
Historical address class: C
Binary address: 11000000.00000000.00000010.00011001

Scope and limitations

IPv4 only; omitting the mask defaults to /24.
/31 uses two point-to-point addresses; /32 is a single host.

Common mistakes

Do not use noncontiguous masks or leading-zero octets; counts do not establish allocation or reachability.

Privacy and browser support

Input is processed in this browser. Do not use real keys or active sensitive credentials as demonstration data. Device features require browser support and your permission.