Subnet Calculator (IPv4 CIDR)
Calculate IPv4 subnets online. Paste CIDR (e.g. 10.0.0.0/16) for network, broadcast, mask, usable range, and host count.
IPv4 subnet calculator
Result
- Network
- 192.168.1.0/24
- Subnet mask
- 255.255.255.0
- Wildcard
- 0.0.0.255
- Broadcast
- 192.168.1.255
- Usable range
- 192.168.1.1 – 192.168.1.254
- Usable hosts
- 254
How to use
- Type CIDR like 10.0.0.0/16.
- Read network, broadcast, mask, usable range, and host count.
- Copy the values into your network config.
FAQ
Why 2 fewer hosts?
Network and broadcast addresses aren't assignable — /24 gives 254 usable, not 256.
/31 and /32?
Point-to-point links with no usable range — shown as such instead of negative math.