Developer
IP Subnet Calculator
Enter an IPv4 address in CIDR notation to get network, broadcast, mask, and host counts.
192.168.1.0/24
- Network address
- 192.168.1.0
- Broadcast address
- 192.168.1.255
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- First usable host
- 192.168.1.1
- Last usable host
- 192.168.1.254
- Total hosts
- 256
- Usable hosts
- 254
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Frequently Asked Questions
Quick answers to common questions
What is CIDR notation?+
CIDR (Classless Inter-Domain Routing) writes an IP address followed by a slash and prefix length, e.g. 192.168.1.0/24.
What does /24 mean?+
A /24 subnet uses 24 bits for the network portion, giving a subnet mask of 255.255.255.0 and 256 total addresses.
Usable vs total hosts?+
For subnets /30 and smaller, all addresses may be usable. For /29 and larger, network and broadcast addresses are reserved.
IPv6 support?+
This tool calculates IPv4 subnets only.
Private IP ranges?+
Works with any valid IPv4 address including 10.x, 172.16–31.x, and 192.168.x private ranges.
Is data sent to a server?+
No. All calculations run in your browser.
Copy results?+
Yes. Use the Copy button to copy all subnet details.
Free?+
Yes.