Subnet Calculator
Network, broadcast, host range and mask from CIDR notation.
Network address
192.168.1.0/24
Subnet mask
255.255.255.0
Broadcast
192.168.1.255
First host
192.168.1.1
Last host
192.168.1.254
Usable hosts
254
Total addresses
256
ShowHide the working
- 1Mask /24 = 255.255.255.0
- 2Network = IP AND mask = 192.168.1.0
- 3Broadcast = network OR ~mask = 192.168.1.255
Formula
network = IP AND mask; broadcast = network OR ~maskHow it works
Works out the network and broadcast addresses, host range and usable host count for an IPv4 address in CIDR notation.
Example
192.168.1.10/24 has 254 usable hosts, from .1 to .254.
About the Subnet Calculator
Network, broadcast, host range and mask from CIDR notation. It sits in the Developer section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Subnet Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Subnet Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Subnet Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Developer?
- Bases, bitwise math, timestamps, data sizes and aspect ratios. You can browse the full Developer category for related calculators.